Only return a warning message about not all files being unpacked if there

were indeed files that weren't unpacked.

Lib/plat-mac/pimp.py

@@ -131,6 +131,7 @@ class PimpTarUnpacker(PimpUnpacker):
             tf.extract(member, self._dir)
         if skip:
             names = [member.name for member in skip if member.name[-1] != '/']
+            if names:
 	            return "Not all files were unpacked: %s" % " ".join(names)
         
 ARCHIVE_FORMATS = [