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Stan Hu authored
Attempting to view an annotated tag in the TreeController would result in `NoMethodError: undefined method 'tree'` when Rugged was in use. `Blob#find_by_rugged` assumes that the ref is a true. Using the commit ID ensures that the right ref is being used. Note that in 11.1, `Blob#find` no longer uses Rugged, so this is only a bug in 11.0. Closes gitlab-org/gitlab-ce#47797
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