silently ingore uncataloging absent id

lib/python/Products/ZCatalog/Catalog.py

@@ -369,9 +369,7 @@ class Catalog(Persistent, Acquisition.Implicit):
         catalogued, otherwise it will not get removed from the catalog
 
         """
-        if uid not in self.uids.keys():
-            raise ValueError, "Uncatalog of absent id %s" % `uid`
-        
+        try:
             rid = self.uids[uid]
 
             for x in self.indexes.values():
@@ -385,6 +383,9 @@ class Catalog(Persistent, Acquisition.Implicit):
             del self.uids[uid]
             del self.paths[rid]
 
+        except:
+            pass
+
     def clear(self):
         """ clear catalog """