### 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)

}
		}
		if (a->track_get_type(i) == Animation::TYPE_AUDIO) {
			if (!node_cache->audio_anim.has(a->track_get_path(i).get_concatenated_names())) {
				TrackNodeCache::AudioAnim aa;
				aa.object = (Object *)child;
				aa.audio_stream.instantiate();
				aa.audio_stream->set_polyphony(audio_max_polyphony);
				node_cache->audio_anim[a->track_get_path(i).get_concatenated_names()] = aa;
			}
		}
		node_cache->last_setup_pass = setup_pass;
	}
}
static void _call_object(Object *p_object, const StringName &p_method, const Vector<Variant> &p_params, bool p_deferred) {
	
	const Variant **argptrs = (const Variant **)alloca(sizeof(const Variant **) * p_params.size());
	const Variant *args = p_params.ptr();
	uint32_t argcount = p_params.size();
	for (uint32_t i = 0; i < argcount; i++) {
		argptrs[i] = &args[i];
	}
	if (p_deferred) {
		MessageQueue::get_singleton()->push_callp(p_object, p_method, argptrs, argcount);
	} else {
		Callable::CallError ce;
		p_object->callp(p_method, argptrs, argcount, ce);
	}
}
Variant AnimationPlayer::post_process_key_value(const Ref<Animation> &p_anim, int p_track, Variant p_value, const Object *p_object, int p_object_idx) {