Uplink category fix

Author: Oblisk234

code/controllers/subsystem/blackmarket.dm

@@ -33,6 +33,7 @@ SUBSYSTEM_DEF(blackmarket)
 			markets[M].add_item(item)
 		qdel(I)
 	. = ..()
+	return SS_INIT_SUCCESS
 
 /datum/controller/subsystem/blackmarket/fire(resumed)
 	while(length(queued_purchases))

code/modules/cargo/blackmarket/blackmarket_uplink.dm

@@ -18,6 +18,14 @@
 
 /obj/item/blackmarket_uplink/Initialize(mapload)
 	. = ..()
+	// We don't want to go through this at mapload because the SSblackmarket isn't initialized yet.
+	if(mapload)
+		return
+
+	update_viewing_category()
+
+/// Simple internal proc for updating the viewing_category variable.
+/obj/item/blackmarket_uplink/proc/update_viewing_category()
 	if(accessible_markets.len)
 		viewing_market = accessible_markets[1]
 		var/list/categories = SSblackmarket.markets[viewing_market].categories
@@ -56,6 +64,9 @@
 	to_chat(user, span_notice("You withdraw [amount_to_remove] credits into a holochip."))
 
 /obj/item/blackmarket_uplink/ui_interact(mob/user, ui_key = "main", datum/tgui/ui = null, force_open = FALSE, datum/tgui/master_ui = null, datum/ui_state/state = GLOB.default_state)
+	if(!viewing_category)
+		update_viewing_category()
+
 	ui = SStgui.try_update_ui(user, src, ui)
 	if(!ui)
 		ui = new(user, src, "BlackMarketUplink", "Black Market Uplink")