Stops initialization from grinding to a halt when loading maps

code/controllers/subsystem.dm

@@ -6,6 +6,7 @@
 	var/priority = FIRE_PRIORITY_DEFAULT	//When mutiple subsystems need to run in the same tick, higher priority subsystems will run first and be given a higher share of the tick before MC_TICK_CHECK triggers a sleep
 
 	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/subsystem_initialized = FALSE	//set to TRUE after it has been initialized, will obviously never be set if the subsystem doesn't initialize
 	var/runlevels = RUNLEVELS_DEFAULT	//points of the game at which the SS can fire
 
 	//set to 0 to prevent fire() calls, mostly for admin use or subsystems that may be resumed later
@@ -154,6 +155,7 @@
 
 //used to initialize the subsystem AFTER the map has loaded
 /datum/controller/subsystem/Initialize(start_timeofday)
+	subsystem_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>")