The equality operator is used to determine whether the next background
in the cycle should be loaded, to avoid pointless loads of the same
background several times (see #13362 and #13393). Its omission in the
latter pull caused seasonal backgrounds to no longer cycle.
Closes#13508.
- Replace the sprite with a solid black box when a storyboard requests it.
- Create a new storyboard instance and exclude the fail layer as well as strip all samples from it
- Do not attempt in creating the storyboard when it isn't needed