simplify euler

Author: vegard-solum-4ss

src/smsfusion/_smoothing.py

@@ -226,9 +226,6 @@ def euler(self, degrees: bool = False) -> NDArray:
             Euler angles estimates for each of the N time steps where the smoother has
             been updated with measurements.
         """
-        x = self.x
-        if x.size == 0:
-            return np.array([])
         theta = np.array([_euler_from_quaternion(q) for q in self.quaternion()])
 
         if degrees: