Benjamin Peterson  committed 3ce922a

don't return node if it is not changed

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File lib2to3/fixes/

                     handle_tuple(arg, add_prefix=(i > 0))
         if not new_lines:
-            return node
+            return
         # This isn't strictly necessary, but it plays nicely with other fixers.
         # TODO(cwinter) get rid of this when children becomes a smart list