--- a/server/msplanner.py	Tue Sep 20 15:14:04 2011 +0200
+++ b/server/msplanner.py	Wed Sep 21 17:38:00 2011 +0200
@@ -1640,7 +1640,7 @@
         self._pending_vrefs = []
         try:
             res = self.visit_default(node, newroot, terms)[0]
-        except:
+        except Exception:
             # when a relation isn't supported, we should dereference potentially
             # introduced variable refs
             for vref in self._pending_vrefs: