Merge pull request #14813 from tgstation/duncathan-patch-2

Fixes asteroid turfs releasing air after being mined

code/game/turfs/turf.dm

@@ -161,8 +161,8 @@
 					total.temperature += S.air.temperature
 				turf_count++
 
+		air.copy_from(total)
 		if(turf_count) //if there weren't any open turfs, no need to update.
-			air.copy_from(total)
 			var/list/air_gases = air.gases
 			for(var/id in air_gases)
 				air_gases[id][MOLES] /= turf_count //Averages contents of the turfs, ignoring walls and the like
@@ -344,4 +344,4 @@
 	name = "iced rock"
 	desc = "Extremely densely-packed sheets of ice and rock, forged over the years of the harsh cold."
 	icon = 'icons/turf/walls.dmi'
-	icon_state = "icerock"
+	icon_state = "icerock"