### 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
}
				}
				Ref<Script> scr = ResourceLoader::load(path);
				if (!scr.is_valid()) {
					EditorNode::get_singleton()->show_warning(TTR("Could not load file at:") + "\n\n" + path, TTR("Error!"));
					file_dialog_option = -1;
					return;
				}
				edit(scr);
				file_dialog_option = -1;
			} else {
				Error error;
				Ref<TextFile> text_file = _load_text_file(path, &error);
				if (error != OK) {
					EditorNode::get_singleton()->show_warning(TTR("Could not load file at:") + "\n\n" + path, TTR("Error!"));
				}
				if (text_file.is_valid()) {
					edit(text_file);
					file_dialog_option = -1;
				}
			}
		} break;
		case FILE_SAVE_ALL: {
			if (_test_script_times_on_disk()) {
				return;
			}
			save_all_scripts();
		} break;
		case SEARCH_IN_FILES: {
			_on_find_in_files_requested("");