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.
Mercurial
=========
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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