Handle disposing GIF background from outside palette #7515
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Resolves #7514
When disposing a GIF frame, Pillow doesn't currently consider that a background index might be higher than the current size of the palette. If that happens, the following code
Pillow/src/PIL/GifImagePlugin.py
Line 338 in c9f7a82
creates an empty tuple, leading to a TypeError when
Pillow/src/PIL/GifImagePlugin.py
Line 369 in c9f7a82
tries to create an image filled with an empty tuple.
Instead, this PR uses the first palette entry in such a scenario. This is in line with our default if there is no background.