Cluster OB now respects if a hive core is created while it is firing. (…

…#3600)

# About the pull request

It checks for OB protection on the turf now. It'll remove the turf from
consideration and try a different one. If no valid turfs remain the OB
stops.

# Explain why it's good for the game

Seems fair enough, very niche case though.


# Testing Photographs and Procedure



# Changelog

:cl:
balance: Cluster OBs will now no longer hit turfs that have gotten OB
protection after the initial OB was fired.
/:cl:

code/modules/cm_marines/orbital_cannon.dm

@@ -484,14 +484,13 @@ var/list/ob_type_fuel_requirements
 	var/list/turf_list = list()
 
 	for(var/turf/T in range(range_num, target))
-		if(protected_by_pylon(TURF_PROTECTION_OB, T))
-			continue
-
 		turf_list += T
 
 	for(var/i = 1 to total_amount)
 		for(var/k = 1 to instant_amount)
 			var/turf/U = pick(turf_list)
+			if(protected_by_pylon(TURF_PROTECTION_OB, U)) //If the turf somehow gained OB protection while the cluster was firing
+				continue
 			fire_in_a_hole(U)
 		sleep(delay_between_clusters)