BHV-16137: Only set rtl property when there is content.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #902 from enyojs/BHV-16137-aarontam

BHV-16137: Only set rtl property when there is content.

Reviewed-By: Art Dahm (art.dahm@lge.com)
Integrated-by: Ryan Duffy (ryan.duffy@lge.com)