### Godot version

4.0.beta13

### System information

Windows 10

### Issue description

When you call the `seek()` function without a current animation it outputs `Condition "!playback.current.from" is true.` to the debugger.

I was getting the error above whenever I would call `stop()` on an AnimationPlayer when it didn't have a playing animation. I realized that `stop()` also calls the `seek()` function.

I would expect the `seek()` and `stop()` functions to just do nothing, instead of throwing errors, if there isn't a current animation, or at least show an error that says that there is no animation to seek/stop.

This is the same issue that was described here: [#6122](https://github.com/godotengine/godot/issues/6122)

### Steps to reproduce

- Create an AnimationPlayer node.
- Don't have it play any animations.
- Call the `seek()` function.

### Minimal reproduction project

[seek_issue.zip](https://github.com/godotengine/godot/files/10442071/seek_issue.zip)

reset_on_save = p_enabled;
}
bool AnimationPlayer::is_reset_on_save_enabled() const {
	return reset_on_save;
}
void AnimationPlayer::set_process_callback(AnimationProcessCallback p_mode) {
	if (process_callback == p_mode) {
		return;
	}
	bool pr = processing;
	if (pr) {
		_set_process(false);
	}
	process_callback = p_mode;
	if (pr) {
		_set_process(true);
	}
}
AnimationPlayer::AnimationProcessCallback AnimationPlayer::get_process_callback() const {
	return process_callback;
}
void AnimationPlayer::set_method_call_mode(AnimationMethodCallMode p_mode) {
	method_call_mode = p_mode;
}
AnimationPlayer::AnimationMethodCallMode AnimationPlayer::get_method_call_mode() const {
	return method_call_mode;
}
void AnimationPlayer::set_audio_max_polyphony(int p_audio_max_polyphony) {