Prevent instantiating NULL palettes #6448
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This PR aims to fix #6447.
Briefly, using the
replace_null()function will setNULLelements when replacements are not present. SuchNULLelements would then override proper palettes causing the bug. This PR prevents those palettes from being initiated toNULLelements. This still allows an explicittheme(palette.colour.continuous = NULL)to replace an older palette.