ENYO-312: Guard against non-existent branding image control.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #1704 from enyojs/ENYO-312-aarontam

ENYO-312: Guard against non-existent branding image control.

Reviewed-By: Blake Stephens (blake.stephens@lge.com)
Integrated-by: Ryan Duffy (ryan.duffy@lge.com)