Hardsuit Helmets can now be used as internals masks. Rejoice, CE mains.

Also reworks internals code a little to be much more friendly. Any head or mask item with the flag should now function as an internals mask if it has the ALLOWSINTERNALS flag.

code/game/objects/items/tanks/tanks.dm

@@ -33,13 +33,19 @@
 		H.update_internals_hud_icon(0)
 	else
 		if(!H.getorganslot(ORGAN_SLOT_BREATHING_TUBE))
-			if(!H.wear_mask)
-				to_chat(H, "<span class='warning'>You need a mask!</span>")
-				return
-			if(H.wear_mask.mask_adjusted)
-				H.wear_mask.adjustmask(H)
-			if(!(H.wear_mask.clothing_flags & MASKINTERNALS))
-				to_chat(H, "<span class='warning'>[H.wear_mask] can't use [src]!</span>")
+			var/obj/item/clothing/check
+			var/internals = FALSE
+
+			for(check in H.get_internal_slots())
+				if(istype(check, /obj/item/clothing/mask))
+					var/obj/item/clothing/mask/M = check
+					if(M.mask_adjusted)
+						M.adjustmask(H)
+				if(CHECK_BITFIELD(check.clothing_flags, ALLOWINTERNALS))
+					internals = TRUE
+
+			if(!internals)
+				to_chat(H, "<span class='warning'>You are not wearing an internals mask!</span>")
 				return
 
 		if(H.internal)