def add_subdispatch(self, dispatcher, prefix=''):
        self.subdispatchers.setdefault(prefix, []).append(dispatcher)
Show that UnProcessableEntity is raised with empty comitter.
dataset/ETHPy150Open mbr/tinyrpc/tinyrpc/dispatch/__init__.py/RPCDispatcher.add_subdispatch--crossover with--dataset/ETHPy150Open sigmavirus24/github3.py/tests/integration/test_repos_repo.py/TestRepository.test_create_commit_with_empty_committer