--- a/mercurial/patch.py	Fri Jan 16 15:19:57 2015 -0800
+++ b/mercurial/patch.py	Fri Jan 16 15:22:29 2015 -0800
@@ -1755,11 +1755,8 @@
 
     def diffline(f, revs):
         if not repo.ui.quiet:
-            if revs:
-                revinfo = ' '.join(["-r %s" % rev for rev in revs])
-                line = 'diff %s %s\n' % (revinfo, f)
-            else:
-                line = 'diff %s\n' % f
+            revinfo = ' '.join(["-r %s" % rev for rev in revs])
+            line = 'diff %s %s\n' % (revinfo, f)
         else:
             line = ''
         return line