wix: bump MSI based installers to use Python 2.7
We're somewhat forced to use Python 2.7 for the bdist packages, so we might
as well use 2.7 for the MSI installers as well.
merge: handle case when heads are all bookmarks
If all heads are bookmarks, merge fails to find what node to merge
with (throws an IndexError while indexing into the non-bookmark heads
list) as of
4a02cf4fbb2e. This catches that case and prints an error
to specify a rev explicitly.
verify: do not choke on valid changelog without manifest
Before this change:
$ hg init
$ hg branch foo
$ hg ci -m branchfoo
$ hg verify
checking changesets
checking manifests
0: empty or missing manifest
crosschecking files in changesets and manifests
checking files
0 files, 1 changesets, 0 total revisions
1 integrity errors encountered!
(first damaged changeset appears to be 0)
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