Prevent maintenance drones from using chem dispensers. (#26058)

* Prevent maintenance drones from using chem dispensers.

* emagged, message

code/modules/reagents/chemistry/machinery/chem_dispenser.dm

@@ -302,6 +302,12 @@
 	default_unfasten_wrench(user, I, 4 SECONDS)
 
 /obj/machinery/chem_dispenser/attack_ai(mob/user)
+	if(isdrone(user))
+		var/mob/living/silicon/robot/drone/drone = user
+		if(!drone.emagged)
+			// There's nothing a drone can do here that wouldn't violate their laws and/or the rules.
+			to_chat(user, "<span class='warning'>Your safety protocols refuse to connect to [src].</span>")
+			return
 	return attack_hand(user)
 
 /obj/machinery/chem_dispenser/attack_ghost(mob/user)