If highlighting is active but the Tiptap state has color is empty, we should fall back to showing the "active color" in button and color-picker as the defaultMarkColor. We were already doing this if the color was null, but this fixes it so it behaves that way if the color attribute is an empty string too.
If highlighting is active but the Tiptap state has color is empty, we should fall back to showing the "active color" in button and color-picker as the defaultMarkColor. We were already doing this if the color was
null, but this fixes it so it behaves that way if thecolorattribute is an empty string too.