Update exception list for auth02mozdef cron

Signed-off-by: Brandon Myers <bmyers@mozilla.com>

cron/auth02mozdef.py

@@ -259,10 +259,12 @@ def process_msg(mozmsg, msg):
         details['action'] = msg.details.response.body.name
     except KeyError:
         try:
-            details['errormsg'] = msg.details.error.message
             details['error'] = 'true'
+            details['errormsg'] = msg.details.error.message
         except KeyError:
             pass
+        except AttributeError:
+            pass
         details['username'] = msg.user_name
 
     try: