Precompiled executables should fail gracefully if a dependency fails to load

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="96" height="96"hspace="10"> Issue by nex3
Originally opened as dart-lang/sdk#20748

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From running "pub get" on pop pop win:

Resolving dependencies...

• barback 0.15.0+1
• bot 0.27.0+2
• browser 0.10.0+2
• chrome 0.5.6 (0.6.1 available)
• collection 1.0.0
• matcher 0.11.1
• path 1.3.0
• pool 1.0.1
• source_span 1.0.0
• stack_trace 1.0.2
• stagexl 0.9.4+2
• unittest 0.11.0+5
  Changed 12 dependencies!
  Precompiling executables...
  Loading source assets...
  Failed to precompile chrome:setup_app:
  Unhandled exception:
  Uncaught Error: Failure getting http://localhost:56686/packages/unscripted/unscripted.dart: 404 Not Found
  Stack Trace:
  #­0 _asyncLoadError (dart:_builtin:339)
  #­1 _httpGet.<anonymous closure>.<anonymous closure> (dart:_builtin:128)
  #­2 _RootZone.runGuarded (dart:async/zone.dart:1009)
  #­3 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:390)
  #­4 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:399)
  #­5 _BufferingStreamSubscription._close (dart:async/stream_impl.dart:290)
  #­6 _ForwardingStream._handleDone (dart:async/stream_pipe.dart:94)
  #­7 _handleDone (dart:async/stream_pipe.dart:162)
  #­8 _RootZone.runGuarded (dart:async/zone.dart:1009)
  #­9 _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:390)
  #­10 _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:399)
  #­11 _DelayedDone.perform (dart:async/stream_impl.dart:614)
  #­12 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:711)
  #­13 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:671)
  #­14 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
  #­15 _asyncRunCallback (dart:async/schedule_microtask.dart:48)
  #­16 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
  #­17 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

­0 _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:820)

­1 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)

­2 _asyncRunCallback (dart:async/schedule_microtask.dart:48)

­3 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)

­4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

Unfortunately due to issue dart-lang/sdk#1 there's not a great way to handle these exceptions, but we can do some manual string parsing and convert them to something a little nicer.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Issue #1115 has been merged into this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/405837?v=3" align="left" width="48" height="48"hspace="10"> Comment by zoechi

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Issue #1115 has been merged into this issue.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Issue #1175 has been merged into this issue.

[nex3]

This error has since been improved.