### 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)

ERR_FAIL_COND_V(p_animation_library.is_null(), ERR_INVALID_PARAMETER);
#ifdef DEBUG_ENABLED
	ERR_FAIL_COND_V_MSG(String(p_name).contains("/") || String(p_name).contains(":") || String(p_name).contains(",") || String(p_name).contains("["), ERR_INVALID_PARAMETER, "Invalid animation name: " + String(p_name) + ".");
#endif
	int insert_pos = 0;
	for (const AnimationLibraryData &lib : animation_libraries) {
		ERR_FAIL_COND_V_MSG(lib.name == p_name, ERR_ALREADY_EXISTS, "Can't add animation library twice with name: " + String(p_name));
		ERR_FAIL_COND_V_MSG(lib.library == p_animation_library, ERR_ALREADY_EXISTS, "Can't add animation library twice (adding as '" + p_name.operator String() + "', exists as '" + lib.name.operator String() + "'.");
		if (lib.name.operator String() >= p_name.operator String()) {
			break;
		}
		insert_pos++;
	}
	AnimationLibraryData ald;
	ald.name = p_name;
	ald.library = p_animation_library;
	animation_libraries.insert(insert_pos, ald);
	ald.library->connect(SNAME("animation_added"), callable_mp(this, &AnimationPlayer::_animation_added).bind(p_name));
	ald.library->connect(SNAME("animation_removed"), callable_mp(this, &AnimationPlayer::_animation_removed).bind(p_name));
	ald.library->connect(SNAME("animation_renamed"), callable_mp(this, &AnimationPlayer::_animation_renamed).bind(p_name));
	ald.library->connect(SNAME("animation_changed"), callable_mp(this, &AnimationPlayer::_animation_changed));
	_animation_set_cache_update();
	notify_property_list_changed();
	return OK;
}
void AnimationPlayer::remove_animation_library(const StringName &p_name) {