Fix BMP save of a P image with an empty palette - #9746

Fix BMP save of a P image with an empty palette#9746

radarhere merged 2 commits into

python-pillow:mainpython-pillow/Pillow:mainfrom

binggao1230:fix-bmp-empty-palettebinggao1230/Pillow:fix-bmp-empty-paletteCopy head branch name to clipboard