### 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)

for (const AnimationLibraryData &lib : animation_libraries) {
		if (lib.name == p_name) {
			return lib.library;
		}
	}
	ERR_FAIL_V(Ref<AnimationLibrary>());
}
TypedArray<StringName> AnimationPlayer::_get_animation_library_list() const {
	TypedArray<StringName> ret;
	for (const AnimationLibraryData &lib : animation_libraries) {
		ret.push_back(lib.name);
	}
	return ret;
}
void AnimationPlayer::get_animation_library_list(List<StringName> *p_libraries) const {
	for (const AnimationLibraryData &lib : animation_libraries) {
		p_libraries->push_back(lib.name);
	}
}
bool AnimationPlayer::has_animation(const StringName &p_name) const {
	return animation_set.has(p_name);
}
Ref<Animation> AnimationPlayer::get_animation(const StringName &p_name) const {