MSBuild error message parsing logic fails with errors with no file

[mhegazy]

Configuration errors are not reported in a specific source file. for instance combining sourceMap and inlineSourceMap in tsconfig.json results in this MSBuild log:

1>  C:\Program Files (x86)\Microsoft SDKs\TypeScript\2.0\tsc.exe --project "C:\Users\mhegazy\Documents\Visual Studio 2015\Projects\TypeScriptHTMLApp46\TypeScriptHTMLApp46\tsconfig.json" --listEmittedFiles
1>  C:\Users\mhegazy\Documents\Visual Studio 2015\Projects\TypeScriptHTMLApp46\TypeScriptHTMLApp46\error TS5053:Build:Option 'sourceMap' cannot be specified with option 'inlineSourceMap'.
1>C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\TypeScript\Microsoft.TypeScript.targets(223,5): error MSB6006: "tsc.exe" exited with code 1.

specifically:

C:\Users\mhegazy\Documents\Visual Studio 2015\Projects\TypeScriptHTMLApp46\TypeScriptHTMLApp46\error TS5053:Build:Option* 'sourceMap' cannot be specified with option 'inlineSourceMap'.

this results in VS not parsing the output correctly and reporting tsc.exe exited with status 1 error.

see #9781 (comment) for more details.

[paulvanbrenk]

Fix in CR