removed unnecessary error message

Change-Id: I4da361db638a63638ac07560cf6d5cfb3ad571d2
fixed null pointer error

Change-Id: I61404c12db68db26baa8e590567914b9eb6b5c7d
now behaving correctly when no column is specified

Change-Id: I516a99ed81c415a75f816f53bcf6a54022c37f83
fixed infinite async loop

Change-Id: Id1ebe59c787cd220ab69b469e528e4bb0a4563b9