_prune_plib_registry: correct _match_contents use

diff --git a/pym/portage/dbapi/vartree.py b/pym/portage/dbapi/vartree.py
index cd93a12ff11c72cfc1631bdc28cc22e6b86571f6..60d52a83eca46c3e08f44fd1f2baffe548f6a633 100644 (file)
--- a/pym/portage/dbapi/vartree.py
+++ b/pym/portage/dbapi/vartree.py
@@ -1532,7 +1532,7 @@ class dblink(object):
                                        if unmerge_preserve:
                                                for path in sorted(unmerge_preserve):
                                                        contents_key = self._match_contents(path)
-                                                       if contents_key is None:
+                                                       if not contents_key:
                                                                continue
                                                        obj_type = self.getcontents()[contents_key][0]
                                                        self._display_merge(_(">>> needed   %s %s\n") % \