### Godot version

3.5.1mono

### System information

windows10

### Issue description

Error message
 scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
 scene/main/node.cpp:397 - Parameter "p_child" is null.
 scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).
See "Steps to reproduce for details"

### Steps to reproduce

Set an external text editor
Create a script
Drop the script to the built-in text editor like this image:
![image](https://user-images.githubusercontent.com/119792950/209504041-039f2620-5e42-4c0f-8c41-cd24486fb3d2.png)
And got error message:
 scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
 scene/main/node.cpp:397 - Parameter "p_child" is null.
 scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).

### Minimal reproduction project

An empty project
TreeItem *ti = search_options->get_selected();
	if (!ti) {
		return;
	}
	int line = ti->get_text(0).get_slice(":", 1).to_int();
	emit_signal(SNAME("goto_line"), line - 1);
	hide();
}
void ScriptEditorQuickOpen::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			connect("confirmed", callable_mp(this, &ScriptEditorQuickOpen::_confirmed));
			search_box->set_clear_button_enabled(true);
			[[fallthrough]];
		}
		case NOTIFICATION_VISIBILITY_CHANGED: {
			search_box->set_right_icon(search_options->get_theme_icon(SNAME("Search"), SNAME("EditorIcons")));
		} break;
		case NOTIFICATION_EXIT_TREE: {
			disconnect("confirmed", callable_mp(this, &ScriptEditorQuickOpen::_confirmed));
		} break;
	}
}
void ScriptEditorQuickOpen::_bind_methods() {