Invalid session invites render as 100,000 pixels width & height

[eth0fox]

Describe the bug

If you send a session invite while being in no session (literally, crash Local, have your status show as "No session"), this appears to ReCon users as a 100,000 pixel tall monolith.

Screenshots

ReCon Version Number

1.12.1

What Platforms does this occur on?

IOS, Windows, MacOS

Additional Context

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following _TypeError was thrown building MessageInviteRequest(dirty):
type 'Null' is not a subtype of type 'String'

The relevant error-causing widget was:
  MessageInviteRequest
  MessageInviteRequest:file:///Users/fox/dev/ReCon/lib/widgets/messages/message_bubble.dart:36:46

When the exception was thrown, this was the stack:
#0      new Session.fromMap (package:recon/models/session.dart:107:14)
#1      new InviteRequest.fromMap (package:recon/models/invite_request.dart:56:23)
#2      MessageInviteRequest.build (package:recon/widgets/messages/message_invite_request.dart:18:38)
#3      StatelessElement.build (package:flutter/src/widgets/framework.dart:5892:49)
#4      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5820:15)
#5      Element.rebuild (package:flutter/src/widgets/framework.dart:5532:7)
#6      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:5802:5)
#7      ComponentElement.mount (package:flutter/src/widgets/framework.dart:5796:5)
...     Normal element mounting (61 frames)
#68     Element.inflateWidget (package:flutter/src/widgets/framework.dart:4590:20)
#69     MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:7269:36)
#70     MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:7285:32)
...     Normal element mounting (50 frames)
#120    Element.inflateWidget (package:flutter/src/widgets/framework.dart:4590:20)
#121    Element.updateChild (package:flutter/src/widgets/framework.dart:4059:18)
#122    SliverMultiBoxAdaptorElement.updateChild (package:flutter/src/widgets/sliver.dart:1068:37)
#123    SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1052:20)
#124    BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:3101:19)
#125    SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1042:12)
#126    RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:372:23)
#127    RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:2894:17)
#128    PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:1219:15)
#129    RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:2893:14)
#130    RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:360:5)
#131    RenderSliverMultiBoxAdaptor.addInitialChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:460:5)
#132    RenderSliverList.performLayout (package:flutter/src/rendering/sliver_list.dart:79:12)
#133    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#134    RenderSliverEdgeInsetsPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:133:12)
#135    RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:371:11)
#136    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#137    RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:673:13)
#138    RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1684:12)
#139    RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1575:20)
#140    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#141    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#142    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#143    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#144    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#145    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#146    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#147    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#148    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#149    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#150    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#151    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#152    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#153    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#154    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#155    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#156    RenderCustomPaint.performLayout (package:flutter/src/rendering/custom_paint.dart:574:11)
#157    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#158    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#159    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#160    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#161    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#162    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#163    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#164    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#165    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#166    RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:115:18)
#167    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#168    ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:62:11)
#169    RenderStack._computeSize (package:flutter/src/rendering/stack.dart:645:43)
#170    RenderStack.performLayout (package:flutter/src/rendering/stack.dart:680:12)
#171    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#172    ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:62:11)
#173    RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:1203:26)
#174    RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:1257:32)
#175    RenderObject.layout (package:flutter/src/rendering/object.dart:2775:7)
#176    MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:180:12)
#177    _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1112:7)
#178    MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:249:7)
#179    RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:420:14)
#180    RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2623:7)
#181    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1170:18)
#182    PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1183:15)
#183    RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:629:23)
#184    WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1264:13)
#185    RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:495:5)
#186    SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1434:15)
#187    SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1347:9)
#188    SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1200:5)
#189    _invoke (dart:ui/hooks.dart:356:13)
#190    PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:444:5)
#191    _drawFrame (dart:ui/hooks.dart:328:31)

════════════════════════════════════════════════════════════════════════════════════════════════════

Another exception was thrown: A RenderFlex overflowed by 99260 pixels on the right.
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'
Another exception was thrown: type 'Null' is not a subtype of type 'String'