project cracker should throw if invalid project file (xml invalid for example)

[enricosada]

project cracker should throw if invalid project file (xml invalid for example)

now the ProjectCracker.GetProjectOptionsFromProjectFileLogged just an empty FsharpProjectOptions (zero refs, zero source files) and the error (exception info) in the log

[vasily-kirichenko]

Fixed in #812

[dsyme]

Fixed in master, will release in 16.0.2 eventually