Fix for issue #1748. Text is made red only if there are missing, required files.
Merge branch 'master' into issue-1748
Merge pull request #1757 from kubasub/issue-1748

Fix for issue #1748: Student Interface: "0 missing required files" looks scary. Fixes #1748
Merge branch 'master' of https://github.com/ChrisKdon/Markus into issue-1493