Return an empty list when searching for a script by #dbref and there is

no such script.

evennia/scripts/manager.py

@@ -85,7 +85,7 @@ class ScriptDBManager(TypedObjectManager):
             script = []
             dbref = self.dbref(key)
             if dbref or dbref == 0:
-                script = [self.dbref_search(dbref)]
+                script = filter(None, [self.dbref_search(dbref)])
             if not script:
                 script = self.filter(db_key=key)
             return script