Merge pull request #4232 from Verkister/Boom

Fixes the severed legs crashing?

code/modules/mob/living/carbon/human/update_icons.dm

@@ -293,6 +293,8 @@ var/global/list/damage_icon_parts = list()
 		base_icon = chest.get_icon()
 
 		for(var/obj/item/organ/external/part in organs)
+			if(isnull(part) || part.is_stump())
+				continue
 			var/icon/temp = part.get_icon(skeleton)
 			//That part makes left and right legs drawn topmost and lowermost when human looks WEST or EAST
 			//And no change in rendering for other parts (they icon_position is 0, so goes to 'else' part)