### 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
find_in_files_dialog->set_find_in_files_mode(FindInFilesDialog::REPLACE_MODE);
	find_in_files_dialog->set_search_text(text);
	find_in_files_dialog->set_replace_text("");
	find_in_files_dialog->popup_centered();
}
void ScriptEditor::_on_find_in_files_result_selected(String fpath, int line_number, int begin, int end) {
	if (ResourceLoader::exists(fpath)) {
		Ref<Resource> res = ResourceLoader::load(fpath);
		if (fpath.get_extension() == "gdshader") {
			ShaderEditorPlugin *shader_editor = Object::cast_to<ShaderEditorPlugin>(EditorNode::get_singleton()->get_editor_data().get_editor("Shader"));
			shader_editor->edit(res.ptr());
			shader_editor->make_visible(true);
			shader_editor->get_shader_editor(res)->goto_line_selection(line_number - 1, begin, end);
			return;
		} else if (fpath.get_extension() == "tscn") {
			EditorNode::get_singleton()->load_scene(fpath);
			return;
		} else {
			Ref<Script> scr = res;
			if (scr.is_valid()) {
				edit(scr);
				ScriptTextEditor *ste = Object::cast_to<ScriptTextEditor>(_get_current_editor());
				if (ste) {
					ste->goto_line_selection(line_number - 1, begin, end);
				}
				return;
			}
		}
	}