A fix for events_trans.test failure on many hosts (5.1-runtime)

sql/event_data_objects.cc:
  Disable an event if its data in the table is corrupted.
sql/events.cc:
  A fix for events_trans failure on most of the hosts.
  A better error message if the event table is old
  (don't suggest it's corrupted, it may simply have bad data).

sql/event_data_objects.cc

@@ -1043,6 +1043,7 @@ Event_queue_element::load_from_row(THD *thd, TABLE *table)
     status = Event_queue_element::SLAVESIDE_DISABLED;
     break;
   case 'D' :
+  default:
     status = Event_queue_element::DISABLED;
     break;
   }