shithub: rgbds

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Check that colour slot is non-empty before checking for gray-ness

This is otherwise UB, and trips a GLIBCXX assertion (when enabled).

--- a/src/gfx/process.cpp

+++ b/src/gfx/process.cpp

@@ -142,7 +142,7 @@

 		}

 		uint8_t bins = 0;

 		for (auto const &color : colors) {

-			if (color->isTransparent()) {

+			if (!color.has_value() || color->isTransparent()) {

 				continue;

 			}

 			if (!color->isGray()) {