Supermatter sabotage no longer shows up with no supermatter

code/game/gamemodes/objective.dm

@@ -1096,7 +1096,7 @@ GLOBAL_LIST_EMPTY(possible_sabotages)
 	var/approved_targets = list()
 	check_sabotages:
 		for(var/datum/sabotage_objective/possible_sabotage in GLOB.possible_sabotages)
-			if(!is_unique_objective(possible_sabotage.sabotage_type) || possible_sabotage.check_conditions())
+			if(!is_unique_objective(possible_sabotage.sabotage_type) || possible_sabotage.check_conditions() || !possible_sabotage.can_run())
 				continue
 			for(var/datum/mind/M in owners)
 				if(M.current.mind.assigned_role in possible_sabotage.excludefromjob)

code/game/gamemodes/objective_sabotage.dm

@@ -12,6 +12,9 @@
 /datum/sabotage_objective/proc/check_conditions()
 	return TRUE
 
+/datum/sabotage_objective/proc/can_run()
+	return TRUE
+
 /datum/sabotage_objective/processing
 	var/won = FALSE
 
@@ -79,6 +82,9 @@
 		won = max(1-((S.get_integrity()-50)/50),won)
 	return FALSE
 
+/datum/sabotage_objective/processing/supermatter/can_run()
+	return (locate(/obj/machinery/power/supermatter_crystal) in GLOB.machines)
+
 /datum/sabotage_objective/station_integrity
 	name = "Make sure the station is at less than 80% integrity by the end. Smash walls, windows etc. to reach this goal."
 	sabotage_type = "integrity"