Merge pull request #2801 from Nerezza/inventoryruntime

Fixes runtime in inventory.dm

code/modules/mob/inventory.dm

@@ -48,6 +48,8 @@ var/list/slot_equipment_priority = list( \
 //set disable_warning to disable the 'you are unable to equip that' warning.
 //unset redraw_mob to prevent the mob from being redrawn at the end.
 /mob/proc/equip_to_slot_if_possible(obj/item/W as obj, slot, del_on_fail = 0, disable_warning = 0, redraw_mob = 1)
+	if(!W)
+		return 0
 	if(!W.mob_can_equip(src, slot))
 		if(del_on_fail)
 			qdel(W)