def send_ivr_calls(sp_orders, base_url, api_key, extra_data):
    for contact in sp_orders:
        if len(contact) == 10:
            contact = '0'+contact

File "views.py", line 43, in calls if len(contact) == 10:
TypeError: object of type 'NoneType' has no len()

object of type 'NoneType' has no len()