Adds checks for antags being dead or SSD

code/game/antagonist/antagonist_helpers.dm

@@ -21,7 +21,15 @@
 	return current_antagonists ? current_antagonists.len : 0
 
 /datum/antagonist/proc/get_active_antag_count()
-	return get_antag_count() //TODO
+	var/active_antags = 0
+	for(var/datum/mind/player in current_antagonists)
+		var/mob/living/L = player.current
+		if(!L || L.stat == DEAD)
+			continue //no mob or dead
+		if(!L.client && !L.teleop)
+			continue //SSD
+		active_antags++
+	return active_antags
 
 /datum/antagonist/proc/is_antagonist(var/datum/mind/player)
 	if(player in current_antagonists)