graphlog: improve --only-branch handling
The previous code was correct for command line as opts always contains the
default empty lists for --branch and --only-branch options. But calling
graphlog.revset() directly with only --only-branch set would leave it
unprocessed.
Greg Ward, author of the original bfiles extension
Na'Tosha Bard of Unity Technologies
Fog Creek Software
Special thanks to the University of Toronto and the UCOSP program