Remove da_crop reference in ValueError test

Author: Simon-van-Diepen

tests/test_utils.py

@@ -305,4 +305,4 @@ def test_crop_wrong_dimname(self, synthetic_dataarray, crop_geometry):
         da = da.rename({"azimuth": "az"})  # rename azimuth to a wrong name
         geom = crop_geometry
         with pytest.raises(ValueError):
-            da_crop = crop(da, geom)
+            _ = crop(da, geom)