Don't set tool if we don't have a tool dir

                client_outputs=self.__client_outputs(client, job_wrapper),

                working_directory=job_wrapper.tool_working_directory,

                metadata_directory=metadata_directory,

                tool=job_wrapper.tool,

                tool=job_wrapper.tool if job_wrapper.tool and job_wrapper.tool.tool_dir else None,

                config_files=config_files,

                dependencies_description=dependencies_description,

                env=env,