Give a better more correct error message when the database is actually missing and not only a permission problem.
Give a better more correct error message
when the database is actually missing and not
only a permission problem.

This closes #113.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@237 af82e41b-90c4-0310-8c96-b1721e28e2e2

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