tests: add log output after stripping for context for next test
It's not obvious what the repo state will be after stripping some
nodes and obsmarkers, so let's include the log output to make it
easier to follow the test case that comes after.
Differential Revision: https://phab.mercurial-scm.org/D4406
obsutil: make sure "addedmarkers" is not None in getobsoleted()
Similar reasoning as in
52e6171ec822 (obsutil: make sure "addedrevs"
is not None in getobsoleted(), 2018-08-25).
Differential Revision: https://phab.mercurial-scm.org/D4411
revsetlang: fix position of '-' in spaceless 'a-b' expressions
I don't know if there is an observable difference, but it seems like
an obvious fix.
Differential Revision: https://phab.mercurial-scm.org/D4410