fix the call api cannot handle empty results

[caberos]

#issue1788

[allmightyspiff]

This will only resolve the issue when the API results are exactly [[], [], []] which isn't great.

What you should do, is add a check to https://github.com/softlayer/softlayer-python/blob/master/SoftLayer/CLI/formatting.py#L410.

something like

def _format_list(result):
    """Format list responses into a table."""
    
    if not result:
        return result
    table = Table(['value'])
    new_result = [item for item in result if item]
    if len(new_result) == 0: 
        table.add_row(["-"])
        return table
    if isinstance(new_result[0], dict):
        return _format_list_objects(new_result)

   
    for item in new_result:
        table.add_row([iter_to_table(item)])
    return table

And adding a unit test for this specific situation would be good too.

Thanks

[allmightyspiff]

Looks good, thanks