<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def emptyArray(key, add_label=None):
 """An array that starts empty"""


    result = {
        'key': key,
        'startEmpty': True
    }
    if add_label is not None:
        result['add'] = add_label
        result['style'] = {'add': 'btn-success'}
    return result