Update src/app/FakeLib/NuGetHelper.fs

Don't fail if the nuget key is null or emty. references issue #102
Update src/app/FakeLib/NuGetHelper.fs

Report InnerException if Nuget task fails. Closes issue #102
Merge branch 'master' into develop
Report InnerException if Nuget task fails. Closes issue #102
Merge branch 'master' into develop