### 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)

continue;
				}
				Vector3 loc;
				Error err = a->position_track_interpolate(i, p_time, &loc);
				
				if (err != OK) {
					continue;
				}
				loc = post_process_key_value(a, i, loc, nc->node_3d, nc->bone_idx);
				if (nc->accum_pass != accum_pass) {
					ERR_CONTINUE(cache_update_size >= NODE_CACHE_UPDATE_MAX);
					cache_update[cache_update_size++] = nc;
					nc->accum_pass = accum_pass;
					nc->loc_accum = loc;
					nc->rot_accum = nc->init_rot;
					nc->scale_accum = nc->init_scale;
				} else {
					nc->loc_accum = nc->loc_accum.lerp(loc, p_interp);
				}
#endif 
			} break;
			case Animation::TYPE_ROTATION_3D: {
#ifndef _3D_DISABLED
				if (!nc->node_3d) {
					continue;
				}
				Quaternion rot;
				Error err = a->rotation_track_interpolate(i, p_time, &rot);
				
				if (err != OK) {