Fixes bugs

- Tables can't have NODROP or ABSTRACT items placed on them anymore,
same for lockers and crates.
- Fixes a runtime with trying to strip a NODROP or ABSTRACT item.

code/modules/mob/living/carbon/give.dm

@@ -20,6 +20,9 @@
 		I = usr.r_hand
 	if(!I)
 		return
+	if((I.flags & NODROP) || (I.flags & ABSTRACT))
+		usr << "<span class='notice'>That's not exactly something you can give."
+		return
 	if(src.r_hand == null || src.l_hand == null)
 		switch(alert(src,"[usr] wants to give you \a [I]?",,"Yes","No"))
 			if("Yes")

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

@@ -763,6 +763,8 @@ It can still be worn/put on as normal.
 	if(slot_to_process)
 		if(strip_item) //Stripping an item from the mob
 			var/obj/item/W = strip_item
+			if((W.flags & NODROP) || (W.flags & ABSTRACT)) //Just to be sure
+				return
 			target.unEquip(W)
 			if (target.client)
 				target.client.screen -= W