Report errors if no files were found or if source-directories are empty #352
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Supersedes #341, by addressing the root problem.
As @lishaduck pointed out in #341 (comment)
Indeed, when there are no Elm files at all,
elm-review
hangs. I added a test for it, and we're now exiting with an error should that happen. I also added a specific error (and test) for whensource-directories
is empty for some reason.I also
unique
d source-directories we're running, because there was some duplicates otherwise, and that was one additionalglob
call.