ENYO-266 Prevent 'onChange' event when we destroy clientControls.
In multiple select supported, removeControl() calls selectedChanged() without any arguments.
It will destroy clientControls of picker but onChange event is fired during this work.

On the other hand, if we call removeControl without multiple support, it does not fire onChange event.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com