Prevent vape from being emptied if the cap isn't open (#87652)

## About The Pull Request
If the cap isn't open, reagents won't be emptied
## Why It's Good For The Game
It makes no sense and you constantly empty reagents by accident, this
will hopefully prevent this
## Changelog
🆑
fix: e-cigarettes can't be emptied if the cap isn't open
/🆑

Co-authored-by: Ben10Omintrix <138636438+Ben10Omintrix@users.noreply.github.com>

code/game/objects/items/cigarettes.dm

@@ -949,6 +949,9 @@ CIGARETTE PACKETS ARE IN FANCY.DM
 	return TRUE
 
 /obj/item/vape/attack_self(mob/user)
+	if(!screw)
+		balloon_alert(user, "open the cap first!")
+		return
 	if(reagents.total_volume > 0)
 		to_chat(user, span_notice("You empty [src] of all reagents."))
 		reagents.clear_reagents()