Json parser crashes with invalid characters

[distantcam]

Instead, we should ignore the error, log it, and dump the rest of the message as raw text for display.

From raygun:

[JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0.]
Newtonsoft.Json.JsonTextReader.ParseValue():0
Newtonsoft.Json.JsonTextReader.ReadInternal():67
Newtonsoft.Json.JsonTextReader.Read():7
Particular.ServiceInsight.Desktop.CodeParser.JsonParser.Parse(SourcePart text) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\CodeParser\JsonParser.cs:25
Particular.ServiceInsight.Desktop.CodeParser.BaseParser.Parse(String text) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\CodeParser\BaseParser.cs:97
Particular.ServiceInsight.Desktop.CodeParser.CodeLexem.Parse(CodeLanguage lang) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\CodeParser\CodeLexem.cs:36
Particular.ServiceInsight.Desktop.CodeParser.CodeBlockPresenter.FillInlines(String text, InlineCollection collection, Brush brush) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\CodeParser\CodeBlockPresenter.cs:27
Particular.ServiceInsight.Desktop.MessageViewers.JsonViewer.JsonMessageView.Display(String message) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\MessageViewers\JsonViewer\JsonMessageView.xaml.cs:21
Particular.ServiceInsight.Desktop.MessageViewers.JsonViewer.JsonMessageViewModel.OnSelectedMessageChanged() in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\MessageViewers\JsonViewer\JsonMessageViewModel.cs:35
Particular.ServiceInsight.Desktop.MessageViewers.JsonViewer.JsonMessageViewModel.set_SelectedMessage(MessageBody value):35
Particular.ServiceInsight.Desktop.MessageViewers.JsonViewer.JsonMessageViewModel.Handle(SelectedMessageChanged event) in c:\BuildAgent\work\2be762a799648224\src\ServiceInsight.Desktop\MessageViewers\JsonViewer\JsonMessageViewModel.cs:40