Gracefully handle bare repositories on API operations. #1932
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This pull request places safety checks in front of API operations against potential bare repositories. Previously those operations resulted in internal server errors as a consequence of non zero exit codes by the git module or thrown exceptions.
This is based upon the now merged PR go-gitea/git#39 to the git module which was vendored to the gitea master branch in #1824.
This change was also already partly applied to gogs in gogs/gogs#3996.