Merge pull request #671 from PowerGridModel/bugfix/fix-empty-transfor…

…mer-validation

fix also support empty trafo list in validation

src/power_grid_model/validation/utils.py

@@ -196,12 +196,16 @@ def get_indexer(source: np.ndarray, target: np.ndarray, default_value: Optional[
     Raises:
         IndexError: if default_value is None and there were values in target that were not in source
     """
+
     permutation_sort = np.argsort(source)  # complexity O(N_input * logN_input)
     indices = np.searchsorted(source, target, sorter=permutation_sort)  # complexity O(N_update * logN_input)
 
     if default_value is None:
         return permutation_sort[indices]
 
+    if len(source) == 0:
+        return np.full_like(target, fill_value=default_value)
+
     clipped_indices = np.take(permutation_sort, indices, mode="clip")
     return np.where(source[clipped_indices] == target, permutation_sort[clipped_indices], default_value)
 

tests/unit/validation/test_rules.py

@@ -553,14 +553,15 @@ def test_supported_tap_control_side():
     valid = {
         "foo": np.array([(0, 4)], dtype=[("id", "i4"), ("foofoo", "i1")]),
         "bar": np.array([(1, 5)], dtype=[("id", "i4"), ("barbar", "i1")]),
+        "baz": np.array([], dtype=[("id", "i4"), ("bazbaz", "i1")]),
         "regulator": np.array([(2, 0, 6), (3, 1, 7)], dtype=[("id", "i4"), ("regulated", "i4"), ("control", "i1")]),
     }
     errors = all_supported_tap_control_side(
         valid,
         "regulator",
         "control",
         "regulated",
-        [("foo", "foofoo"), ("bar", "barbar"), ("baz", "bazbaz")],
+        [("foo", "foofoo"), ("bar", "barbar"), ("baz", "bazbaz"), ("bla", "blabla")],
     )
     assert not errors