Too remove potential excessive garbage collection per tick. We will be reusing lists for overlays instead of deleting and creating them.

the .Cut() proc on a list will empty a list by default. This also will set the len to 0.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5465 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/detectivework/evidence.dm

@@ -68,7 +68,7 @@
 		var/obj/item/I = contents[1]
 		user.visible_message("[user] takes [I] out of [src]", "You take [I] out of [src].",\
 		"You hear someone rustle around in a plastic bag, and remove something.")
-		overlays = null	//remove the overlays
+		overlays.Cut()	//remove the overlays
 		user.put_in_hands(I)
 		w_class = 1
 		icon_state = "evidenceobj"