[BUG] SettingsPanel can't be added directly to the Scene

[LightTab2]

Description:
SettingsPanel added directly to the Scene fails an assertion at:

func _on_panel_visibility_changed():
	assert(settings_collection)
        ...

Expected behavior:
Instead of the assertion, a normal if check should be made:

func _on_panel_visibility_changed():
	if !settings_collection:
		return
	...

Screenshots:
A structure of the failing Scene:

The assertion failing:

Additional info:

• OS: Windows 11
• Godot Version: 4.3
• Commit: a053ed9