Message if query can't be explained [QAN2]

1. open QAN2
2. Select query like "SHOW ALL SLAVES STATUS" or "SET" or "QUIT

Result: Error " cmd 'Explain' for subsystem 'mysql' failed: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax"
Expected result: If query can't be explained, QAN2 should display message like in QAN , for example"MySQL cannot EXPLAIN SHOW queries"