Fix wands losing a charge even when no shot was actually fired (#4588).

code/modules/projectiles/ammunition.dm

@@ -28,7 +28,7 @@
 	icon_state = "[initial(icon_state)][BB ? "-live" : ""]"
 	desc = "[initial(desc)][BB ? "" : " This one is spent"]"
 
-/obj/item/ammo_casing/proc/newshot() //For energy weapons and shotgun shells.
+/obj/item/ammo_casing/proc/newshot() //For energy weapons, shotgun shells and wands (!).
 	if (!BB)
 		BB = new projectile_type(src)
 	return

code/modules/projectiles/guns/magic.dm

@@ -32,7 +32,11 @@
 /obj/item/weapon/gun/magic/proc/newshot()
 	if (charges && chambered)
 		chambered.newshot()
-		charges--
+	return
+
+/obj/item/weapon/gun/magic/process_chamber()
+	if(chambered && !chambered.BB) //if BB is null, i.e the shot has been fired...
+		charges--//... drain a charge
 	return
 
 /obj/item/weapon/gun/magic/New()