Merge pull request #14006 from DeltaFire15/borg-shell-dupe

Attempting to complete a borg AI shell without a cell installed no longer causes issues

code/game/objects/items/robot/robot_parts.dm

@@ -326,6 +326,9 @@
 	else if(istype(W, /obj/item/borg/upgrade/ai))
 		var/obj/item/borg/upgrade/ai/M = W
 		if(check_completion())
+			if(!chest.cell)
+				to_chat(user, "<span class='warning'>The endoskeleton still needs a power cell!</span>")
+				return
 			if(!isturf(loc))
 				to_chat(user, "<span class='warning'>You cannot install[M], the frame has to be standing on the ground to be perfectly precise!</span>")
 				return
@@ -346,7 +349,6 @@
 				O.lawupdate = FALSE
 				O.make_laws()
 
-
 			O.cell = chest.cell
 			chest.cell.forceMove(O)
 			chest.cell = null