adds a parent level subsystem initialized var (#33456)

code/controllers/subsystem.dm

@@ -8,6 +8,8 @@
 
 	var/flags = 0			//see MC.dm in __DEFINES Most flags must be set on world start to take full effect. (You can also restart the mc to force them to process again)
 
+	var/initialized = FALSE	//set to TRUE after it has been initialized, will obviously never be set if the subsystem doesn't initialize
+
 	//set to 0 to prevent fire() calls, mostly for admin use or subsystems that may be resumed later
 	//	use the SS_NO_FIRE flag instead for systems that never fire to keep it from even being added to the list
 	var/can_fire = TRUE
@@ -156,6 +158,7 @@
 
 //used to initialize the subsystem AFTER the map has loaded
 /datum/controller/subsystem/Initialize(start_timeofday)
+	initialized = TRUE
 	var/time = (REALTIMEOFDAY - start_timeofday) / 10
 	var/msg = "Initialized [name] subsystem within [time] second[time == 1 ? "" : "s"]!"
 	to_chat(world, "<span class='boldannounce'>[msg]</span>")