Minor issue, but header doesn't render properly with changes as of today (Jun 30, 2017)

During render of loading.json the header bar is black, the header image and theme (dark) that I set in my loading.json ([loading.json.zip](https://github.com/Jasonette/JASONETTE-iOS/files/1116812/loading.json.zip)) did work yesterday but not today.

Start by reproducing the header rendering with the attached loading.json.zip and compare the current result with the behavior described for the previous day. Trace how loading.json is loaded and how the header image and dark theme are applied; done means the configured header image and theme render correctly instead of a black bar.

Written by the indexing model from the issue text.