Reduces the effect of EMP on robot power cells

Temporary fix to resolve #8454

code/modules/mob/living/silicon/robot/drone/drone.dm

@@ -5,6 +5,7 @@
 	icon_state = "repairbot"
 	maxHealth = 35
 	health = 35
+	cell_emp_mult = 1
 	universal_speak = 0
 	universal_understand = 1
 	gender = NEUTER

code/modules/mob/living/silicon/robot/robot.dm

@@ -50,6 +50,8 @@ var/list/robot_verbs_default = list(
 	var/obj/item/weapon/cell/cell = null
 	var/obj/machinery/camera/camera = null
 
+	var/cell_emp_mult = 2
+
 	// Components are basically robot organs.
 	var/list/components = list()
 

code/modules/power/cell.dm

@@ -128,6 +128,11 @@
 		rigged = 1 //broken batterys are dangerous
 
 /obj/item/weapon/cell/emp_act(severity)
+	//remove this once emp changes on dev are merged in
+	if(isrobot(loc))
+        var/mob/living/silicon/robot/R = loc
+        severity *= R.cell_emp_mult
+
 	charge -= maxcharge / severity
 	if (charge < 0)
 		charge = 0