Replaces EXCEPTION() with stack_trace() and CRASH()

code/controllers/subsystem/shuttle.dm

@@ -185,14 +185,13 @@ SUBSYSTEM_DEF(shuttle)
 		WARNING("requestEvac(): There is no emergency shuttle, but the \
 			shuttle was called. Using the backup shuttle instead.")
 		if(!backup_shuttle)
-			throw EXCEPTION("requestEvac(): There is no emergency shuttle, \
+			CRASH("requestEvac(): There is no emergency shuttle, \
 			or backup shuttle! The game will be unresolvable. This is \
 			possibly a mapping error, more likely a bug with the shuttle \
 			manipulation system, or badminry. It is possible to manually \
 			resolve this problem by loading an emergency shuttle template \
 			manually, and then calling register() on the mobile docking port. \
 			Good luck.")
-			return
 		emergency = backup_shuttle
 	var/srd = CONFIG_GET(number/shuttle_refuel_delay)
 	if(world.time - SSticker.round_start_time < srd)
@@ -420,7 +419,7 @@ SUBSYSTEM_DEF(shuttle)
 
 /datum/controller/subsystem/shuttle/proc/request_transit_dock(obj/docking_port/mobile/M)
 	if(!istype(M))
-		throw EXCEPTION("[M] is not a mobile docking port")
+		CRASH("[M] is not a mobile docking port")
 
 	if(M.assigned_transit)
 		return