use-of-uninitialized-value in PushColormapIndex

use-of-uninitialized-value in PushColormapIndex: a task in MiMo-V2.6-RL-harbor-cyber: MiMo-V2.6-RL Cyber (Harbor) (Harbor dataset). MemorySanitizer: use-of-uninitialized-value in function PushColormapIndex in file imagemagick/MagickCore/image.c