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
+

game/rooms/room16/room16.tscn

@@ -68,8 +68,8 @@ script = ExtResource( 5 )
 global_id = "r12_l_exit"
 
 [node name="r_door" parent="Hotspots" instance=ExtResource( 8 )]
-global_id = ""
-esc_script = ""
+global_id = "r16_r_exit"
+esc_script = "res://game/rooms/room16/esc/right_exit.esc"
 
 [node name="ESCLocation" type="Position2D" parent="Hotspots/r_door"]
 position = Vector2( 1231.78, 360.624 )

game/rooms/room17/esc/left_exit.esc

@@ -0,0 +1,3 @@
+:exit_scene
+play_snd res://game/sfx/sounds/doorOpen_2.ogg
+change_scene "res://game/rooms/room16/room16.tscn"

game/rooms/room17/room17.tscn

@@ -0,0 +1,81 @@
+[gd_scene load_steps=10 format=2]
+
+[ext_resource path="res://addons/escoria-core/game/core-scripts/esc_terrain.gd" type="Script" id=1]
+[ext_resource path="res://game/rooms/room14/background.tscn" type="PackedScene" id=2]
+[ext_resource path="res://game/fonts/caslonantique.tres" type="DynamicFont" id=3]
+[ext_resource path="res://game/characters/mark/mark.tscn" type="PackedScene" id=4]
+[ext_resource path="res://addons/escoria-core/game/core-scripts/esc_location.gd" type="Script" id=5]
+[ext_resource path="res://addons/escoria-core/game/core-scripts/esc_room.gd" type="Script" id=6]
+[ext_resource path="res://addons/escoria-core/game/core-scripts/esc_item.gd" type="Script" id=7]
+[ext_resource path="res://game/rooms/room14/r_door.tscn" type="PackedScene" id=8]
+
+[sub_resource type="NavigationPolygon" id=1]
+vertices = PoolVector2Array( 1168.92, 640.557, 1182.53, 588.863, 1269.59, 622.872, 1275.03, 799.721, 864.626, 613.518, 1143.08, 613.35, -9.16094, 803.802, 386.666, 618.012, 129.634, 615.792, 84.5821, 654.06, -6.44019, 711.297, 3.15687, 646.051, 59.2201, 628.698 )
+polygons = [ PoolIntArray( 0, 1, 2, 3 ), PoolIntArray( 4, 5, 0, 3, 6, 7 ), PoolIntArray( 8, 7, 6, 9 ), PoolIntArray( 9, 6, 10, 11, 12 ) ]
+outlines = [ PoolVector2Array( -6.44019, 711.297, 3.15687, 646.051, 59.2201, 628.698, 84.5821, 654.06, 129.634, 615.792, 386.666, 618.012, 864.626, 613.518, 1143.08, 613.35, 1168.92, 640.557, 1182.53, 588.863, 1269.59, 622.872, 1275.03, 799.721, -9.16094, 803.802 ) ]
+
+[node name="room17" type="Node2D"]
+script = ExtResource( 6 )
+__meta__ = {
+"_edit_vertical_guides_": [  ]
+}
+global_id = "room17"
+player_scene = ExtResource( 4 )
+camera_limits = [ Rect2( 0, 0, 1289, 555 ) ]
+
+[node name="background" parent="." instance=ExtResource( 2 )]
+
+[node name="room_label" type="Label" parent="background"]
+margin_right = 92.0
+margin_bottom = 21.0
+custom_fonts/font = ExtResource( 3 )
+text = "ROOM 17"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="walkable_area" type="Navigation2D" parent="."]
+script = ExtResource( 1 )
+
+[node name="platform" type="NavigationPolygonInstance" parent="walkable_area"]
+position = Vector2( 6.73163, -264.779 )
+navpoly = SubResource( 1 )
+__meta__ = {
+"_editor_description_": ""
+}
+
+[node name="Hotspots" type="Node" parent="."]
+
+[node name="l_door" type="Area2D" parent="Hotspots"]
+pause_mode = 1
+script = ExtResource( 7 )
+global_id = "r16_l_exit"
+esc_script = "res://game/rooms/room17/esc/left_exit.esc"
+is_exit = true
+tooltip_name = "Left exit"
+default_action = "walk"
+dialog_color = Color( 1, 1, 1, 1 )
+animations = null
+
+[node name="CollisionPolygon2D" type="CollisionPolygon2D" parent="Hotspots/l_door"]
+polygon = PoolVector2Array( 0.328762, 440.897, 1.85199, 119.926, 85.9517, 74.6212, 87.1409, 377.869 )
+
+[node name="Position2D" type="Position2D" parent="Hotspots/l_door"]
+position = Vector2( 37.4521, 392.045 )
+script = ExtResource( 5 )
+global_id = "r12_l_exit"
+
+[node name="r_door" parent="Hotspots" instance=ExtResource( 8 )]
+global_id = ""
+esc_script = ""
+
+[node name="ESCLocation" type="Position2D" parent="Hotspots/r_door"]
+position = Vector2( 1231.78, 360.624 )
+script = ExtResource( 5 )
+
+[node name="start" type="Position2D" parent="Hotspots"]
+position = Vector2( 243.677, 455.569 )
+script = ExtResource( 5 )
+global_id = "start"
+is_start_location = true
+interaction_direction = 180