Fix ansible-test import analysis warning.

Fix overlooked in https://github.com/ansible/ansible/pull/68372/

(cherry picked from commit 77732ed50d)

test/lib/ansible_test/_internal/classification/python.py

@@ -321,6 +321,11 @@ class ModuleUtilFinder(ast.NodeVisitor):
         if is_subdir(self.path, data_context().content.test_path):
             return  # invalid imports in tests are ignored
 
+        path = get_import_path(name, True)
+
+        if os.path.exists(path) and os.path.getsize(path) == 0:
+            return  # zero length __init__.py files are ignored during earlier processing, do not warn about them now
+
         # Treat this error as a warning so tests can be executed as best as possible.
         # This error should be detected by unit or integration tests.
         display.warning('%s:%d Invalid module_utils import: %s' % (self.path, line_number, import_name))