Fixed issue 301.

Fixed a syringe gun runtime.
Added WJohnston's silver head ID, and his new asteroid floor sprites.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3443 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/chemical/Chemistry-Tools.dm

@@ -533,6 +533,8 @@
 				var/turf/trg = get_turf(target)
 				var/obj/effect/syringe_gun_dummy/D = new/obj/effect/syringe_gun_dummy(get_turf(src))
 				var/obj/item/weapon/reagent_containers/syringe/S = syringes[1]
+				if((!S) || (!S.reagents))	//ho boy! wot runtimes!
+					return
 				S.reagents.trans_to(D, S.reagents.total_volume)
 				syringes -= S
 				del(S)

code/modules/mining/mine_turfs.dm

@@ -284,7 +284,7 @@
 	//	seedName = pick(list("1","2","3","4"))
 	//	seedAmt = rand(1,4)
 	if(prob(20))
-		icon_state = "asteroid[rand(0,8)]"
+		icon_state = "asteroid[rand(0,12)]"
 	spawn(2)
 		updateMineralOverlays()