Trying to compare tags or non-
master branches results in an empty response, e.g. "No commits to display." or "There are no merged pull requests."
The URLs for these failed comparisons look like this:
.../branches/compare/tag-1.2.3%0Dtag-1.2.4 .../branches/compare/branch-1.2.x%0Dbranch-1.3.x .../branches/compare/tag-1.2.3%0Dbranch-1.3.x
If either of the fields references a commit or
master, the comparisons work as expected.
The raw git commands, e.g.
git diff tag-1.2.3 tag-1.2.4, show the expected unified diff output.