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Check for error in Parsoid response for math node

Description

Check for error in Parsoid response for math node

An error will contain an element with class "error".
Relies on I3f4ba354a in visual editor core in order to work.

Also remove old afterRender method.

Bug: T112610
Change-Id: Ie681806aebfdd7de918685c9343f5e176baaf517