hg: let extensions call the func without populating opts keys

This change is to help extensions by not forcing them to populate with
opts[b'bundle'] and opts[b'force'] when calling hg.incoming(...)

Differential Revision: https://phab.mercurial-scm.org/D11619

mercurial/hg.py

@@ -1285,7 +1285,7 b' def _incoming('
         if revs:
             revs = [other.lookup(rev) for rev in revs]
         other, chlist, cleanupfn = bundlerepo.getremotechanges(
-            ui, repo, other, revs, opts[b"bundle"], opts[b"force"]
+            ui, repo, other, revs, opts.get(b"bundle"), opts.get(b"force")
         )
 
         if not chlist: