localrepo: simplify by using match.always() method

mercurial/localrepo.py

@@ -1315,7 +1315,7 b' class localrepository(object):'
             wctx = self[None]
             merge = len(wctx.parents()) > 1
 
-            if (not force and merge and (match.files() or match.anypats())):
+            if not force and merge and not match.always():
                 raise util.Abort(_('cannot partially commit a merge '
                                    '(do not specify files or patterns)'))