Fix crash when importing a model in a 3D layer

Author: OverloadedOrama

src/Tools/3DTools/3DShapeEdit.gd

@@ -367,7 +367,7 @@ func _set_node_values(to_edit: Object, properties: Dictionary) -> void:
 		if property_path.ends_with("v2"):
 			property_path = property_path.replace("v2", "")
 		var value = to_edit.get_indexed(property_path)
-		if value == null:
+		if not is_instance_valid(value):
 			continue
 		if "scale" in prop:
 			value *= 100

src/Tools/3DTools/3DShapeEdit.tscn

@@ -2,7 +2,7 @@
 
 [ext_resource type="PackedScene" uid="uid://ctfgfelg0sho8" path="res://src/Tools/BaseTool.tscn" id="1"]
 [ext_resource type="Script" path="res://src/Tools/3DTools/3DShapeEdit.gd" id="2"]
-[ext_resource type="PackedScene" path="res://src/UI/Nodes/Sliders/ValueSliderV2.tscn" id="3"]
+[ext_resource type="PackedScene" uid="uid://bbnqcxa20a5a5" path="res://src/UI/Nodes/Sliders/ValueSliderV2.tscn" id="3"]
 [ext_resource type="PackedScene" uid="uid://yjhp0ssng2mp" path="res://src/UI/Nodes/Sliders/ValueSlider.tscn" id="4"]
 [ext_resource type="Script" path="res://src/UI/Nodes/Sliders/ValueSlider.gd" id="5"]
 [ext_resource type="Script" path="res://src/UI/Nodes/CollapsibleContainer.gd" id="6"]
@@ -521,7 +521,6 @@ unique_name_in_owner = true
 layout_mode = 2
 size_flags_horizontal = 3
 mouse_default_cursor_shape = 2
-selected = 0
 
 [node name="MeshPixelSizeLabel" type="Label" parent="ObjectOptions/MeshOptions/GridContainer" index="24"]
 layout_mode = 2