Project URL was not set correctly in notification mails.
Project URL was not set correctly in notification mails.

We fallback to the `[trac] base_url` in case `[project] url` was not set.

Fixes #3932.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@6657 af82e41b-90c4-0310-8c96-b1721e28e2e2

walty8/trac,netjunki/trac-Pygit2,walty8/trac,walty8/trac,jun66j5/trac-ja,jun66j5/trac-ja,walty8/trac,jun66j5/trac-ja,netjunki/trac-Pygit2,jun66j5/trac-ja,netjunki/trac-Pygit2