Follow-up to r3141, forgot to import `to_unicode` + better error message for timeline event provider failure
Follow-up to r3141, forgot to import `to_unicode` + better error message for timeline event provider failure

git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@3157 af82e41b-90c4-0310-8c96-b1721e28e2e2

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