ENYO-508: Guard against the absence of a last (blurred) control.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #155 from enyojs/ENYO-508-aarontam

ENYO-508: Guard against the absence of a last (blurred) control.

Reviewed-by: Roy Sutton (roy.sutton@lge.com)
Integrated-By: Ryan Duffy (ryan.duffy@lge.com)