Bug 1023312 - [Vertical homescreen] Smart collection viewing fails on th...

...e flame because e.me server fails to return background. [r=amirn]

http://bugzil.la/1023312
we should also update here: https://github.com/EverythingMe/gaia/blob/1023312-floor-dimension/shared/js/everythingme/device.js?pr=%2Fmozilla-b2g%2Fgaia%2Fpull%2F20359#L84-L87