"Reset Live background" causes black background and breaks themes
Steps to produce bug:
1. Send a song to live.
2. Replace live background with an image.
3. Press the "Reset live background" button.
The theme gets a black background,
changing themes does not fix it.
Restarting OpenLP does not fix it,
all of the themes just show black background.
(Solid, Images and transparent themes tested)
You can still replace the black background with images,
but themes are broken.
Log is from after re-starting OpenLP
to see if it would fix the issue.