Amend tests to cooperate with new mypy (thanks @timj)

python/lsst/pipe/base/tests/mocks/_storage_class.py

@@ -628,13 +628,17 @@ def new_get_formatter_class_with_match(
         try:
             return original_get_formatter_class_with_match(self, entity)
         except KeyError:
-            lookup_keys = (LookupKey(name=entity),) if isinstance(entity, str) else entity._lookupNames()
+            lookup_keys: tuple[LookupKey, ...] = (
+                (LookupKey(name=entity),) if isinstance(entity, str) else entity._lookupNames()
+            )
             for key in lookup_keys:
                 # This matches mock dataset type names before mock storage
                 # classes, and it would even match some regular dataset types
                 # that are automatic connections (logs, configs, metadata) of
                 # mocked tasks.  The latter would be a problem, except that
                 # those should have already matched in the try block above.
+                if key.name is None:
+                    continue
                 if is_mock_name(key.name):
                     return (key, JsonFormatter, {})
             raise
@@ -651,8 +655,12 @@ def new_get_formatter_with_match(
         try:
             return original_get_formatter_with_match(self, entity, *args, **kwargs)
         except KeyError:
-            lookup_keys = (LookupKey(name=entity),) if isinstance(entity, str) else entity._lookupNames()
+            lookup_keys: tuple[LookupKey, ...] = (
+                (LookupKey(name=entity),) if isinstance(entity, str) else entity._lookupNames()
+            )
             for key in lookup_keys:
+                if key.name is None:
+                    continue
                 if is_mock_name(key.name):
                     return (key, JsonFormatter(*args, **kwargs))
             raise