Update clip to handle nodata values

src/openeo_processes/math.py

@@ -3323,10 +3323,7 @@ def exec_xar(x, min, max):
             The value clipped to the specified range.
         """
 
-        clip = x.where(x > min, min)
-        clip = clip.where(x < max, max)
-
-        return clip
+        return x.clip(min = min, max = max)
 
     @staticmethod
     def exec_da():

tests/test_math.py

@@ -323,6 +323,9 @@ def test_clip(self):
         xr.testing.assert_equal(
             oeop.clip(self.test_data.xr_data_factor(1, 9), min=1, max=8),
             self.test_data.xr_data_factor(1, 8))
+        xr.testing.assert_equal(
+            oeop.clip(self.test_data.xr_data_factor(np.nan, 9), min=1, max=8),
+            self.test_data.xr_data_factor(np.nan, 8))
 
     def test_quantiles(self):
         """ Tests `quantiles` function. """