created mock of mkdocs for test to continue

Author: silentfatez

readthedocs/rtd_tests/tests/test_doc_builder.py

@@ -159,6 +159,8 @@ def test_project_without_mkdocs_yaml(
         checkout_path.return_value = tmp_dir
         docs_dir.return_value = tmp_dir
         get_mkdocs_yaml_path.side_effect = MkDocsYAMLParseError
+        load_yaml_config.return_value = mock()
+        load_yaml_config.return_value.mkdocs = mock(configuration="mkdocs.yml")
         python_env = Virtualenv(
             version=self.version,
             build_env=self.build_env,