Visual Studio 2017 Bugs

Crash report information:

Problem signature:
  Problem Event Name:	CLR20r3
  Problem Signature 01:	devenv.exe
  Problem Signature 02:	15.0.26228.4
  Problem Signature 03:	58bb453b
  Problem Signature 04:	mscorlib
  Problem Signature 05:	4.6.1590.0
  Problem Signature 06:	5787ed44
  Problem Signature 07:	5bac
  Problem Signature 08:	27
  Problem Signature 09:	StreamJsonRpc.RemoteInvocation
  OS Version:	6.1.7601.2.1.0.320.65
  Locale ID:	1033
  Additional Information 1:	aea4
  Additional Information 2:	aea47495b696e4c5bbba81101f0000f1
  Additional Information 3:	5d2e
  Additional Information 4:	5d2e4e270a7f33a4e1de605074da45c1

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add proper additional document update change handler

Related issues:

• VS crashes when SolutionCreator.UpdateDocumentAsync gets NullReferenceException back over jsonrpc