pullreport: skip or rework some early return

We are about to add more logic in this report. Before that, we need it to not
quit so early.

mercurial/scmutil.py

@@ -1620,13 +1620,13 def registersummarycallback(repo, otr, t
         def reportnewcs(repo, tr):
             """Report the range of new revisions pulled/unbundled."""
             origrepolen = tr.changes.get('origrepolen', len(repo))
-            if origrepolen >= len(repo):
+            unfi = repo.unfiltered()
+            if origrepolen >= len(unfi):
                 return
 
             # Compute the bounds of new visible revisions' range.
             revs = smartset.spanset(repo, start=origrepolen)
-            if not revs:
-                return
+            if revs:
             minrev, maxrev = repo[revs.min()], repo[revs.max()]
 
             if minrev == maxrev:
@@ -1647,7 +1647,8 def registersummarycallback(repo, otr, t
                 msg = _('new changesets %s (%d secrets)\n')
                 msg %= (revrange, secret)
             else:
-                raise error.ProgrammingError('entered unreachable condition')
+                    errormsg = 'entered unreachable condition'
+                    raise error.ProgrammingError(errormsg)
             repo.ui.status(msg)
 
         @reportsummary