subrepo: remove unnecessary else clause in hgsubrepo._get

This revision has no behaviour change. It simply removes an unnecessary else
that follows an if / return block. The change looks big because a big chunk of
code has been unindented one level.

mercurial/subrepo.py

@@ -703,7 +703,6 b' class hgsubrepo(abstractsubrepo):'
         source, revision, kind = state
         if revision in self._repo.unfiltered():
             return
-        else:
             self._repo._subsource = source
             srcurl = _abssource(self._repo)
             other = hg.peer(self._repo, {}, srcurl)