Skip tests if enchant is not installed

Author: Pierre-Sassoulas

tests/checkers/unittest_spelling.py

@@ -47,9 +47,12 @@ def test_spelling_dict_help(self) -> None:
         assert "need to install the system dep" in _get_enchant_dict_help(
             [], pyenchant_available=True
         )
-        assert "Available dictionaries: " in _get_enchant_dict_help(
-            enchant.Broker().list_dicts(), pyenchant_available=True
-        )
+        if enchant is not None:
+            assert "Available dictionaries: " in _get_enchant_dict_help(
+                enchant.Broker().list_dicts(), pyenchant_available=True
+            )
+        else:
+            pytest.skip("'enchant' is not installed.")
 
     @skip_on_missing_package_or_dict
     @set_config(spelling_dict=spell_dict)