py3: make sure __repr__ returns str
No test fails but I found it while debugging test-commit-interactive-curses.t
failure.
# skip-blame because just r'' prefix
Differential Revision: https://phab.mercurial-scm.org/D5878
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown