human
Solve the following python programming problem given the following code:
def _TestInstanceOperationInParallelToInstanceCreation(* cmds) : 
    'Run the given test command in parallel to an instance creation.

  @type cmds: list of list of strings
  @param cmds: commands to execute in parallel to an instance creation. Each
               command in the list is executed once the previous job starts
               to run.

  ' 
    def _SubmitNextCommand(cmd_idx, job_driver, _) : 
        if (cmd_idx >= len (cmds)) : 
            return 
job_id = _ExecuteJobSubmittingCmd (cmds [cmd_idx]) 
        job_driver.AddJob (job_id, success_fn = functools.partial (_SubmitNextCommand, (cmd_idx + 1))) 
assert qa_config.IsTemplateSupported (constants.DT_DRBD8) 
    assert (len (job_driver) > 0) 
    job_driver = _JobQueueDriver () 
    _SubmitNextCommand (0, job_driver, None) 
    _TestParallelInstanceCreationAndRemoval (max_instances = 1, disk_template = constants.DT_DRBD8, custom_job_driver = job_driver) 
    job_driver.WaitForCompletion () 

    
    

    Fix the buggy line: assert (len (job_driver) > 0)
assistant
#Here is Python code to fix the buggy line: assert (len (job_driver) > 0)
.

assert (len (cmds) > 0)