Fix transitions not happening if the ESCRoom has no ESC script (#485)

Fixes godot-escoria/escoria-issues#95

game/rooms/room16/esc/right_exit.esc

@@ -0,0 +1,3 @@
+:exit_scene
+play_snd res://game/sfx/sounds/doorOpen_2.ogg
+change_scene "res://game/rooms/room17/room17.tscn"

game/rooms/room16/esc/room16.esc

@@ -6,3 +6,11 @@
 	set_angle player 90
 	stop
 
+
+
+> [eq ESC_LAST_SCENE room17]
+	teleport player r16_r_exit
+	# Set player look down
+	set_angle player 180
+	stop
+