### 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
if (!pending_auto_reload && auto_reload_running_scripts) {
		call_deferred(SNAME("_live_auto_reload_running_scripts"));
		pending_auto_reload = true;
	}
}
void ScriptEditor::_live_auto_reload_running_scripts() {
	pending_auto_reload = false;
	EditorDebuggerNode::get_singleton()->reload_scripts();
}
bool ScriptEditor::_test_script_times_on_disk(Ref<Resource> p_for_script) {
	disk_changed_list->clear();
	TreeItem *r = disk_changed_list->create_item();
	disk_changed_list->set_hide_root(true);
	bool need_ask = false;
	bool need_reload = false;
	bool use_autoreload = bool(EDITOR_GET("text_editor/behavior/files/auto_reload_scripts_on_external_change"));
	for (int i = 0; i < tab_container->get_tab_count(); i++) {
		ScriptEditorBase *se = Object::cast_to<ScriptEditorBase>(tab_container->get_tab_control(i));
		if (se) {