The system will crash when we receive nothing in `response` and also tryig to retrieve values from response.

**Error:-**
`TypeError: 'NoneType' object is not subscriptable`

**Root Cause:-**
- While we are in `EC Company`.
- When we click `Process Now` on the invoice. It will call `button_process_edi_web_services` method. And while in execution when at [1], `move.company_id._l10n_ec_is_demo_environment()` is `False`, then it calls `_l10n_ec_send_document` method.
- While submitting electronic invoices to SRI, the method `_l10n_ec_get_client_service_response_new()` sometimes returns `None` .
- It may also lack expected keys like 'estado' or 'comprobantes', depending on SRI’s behavior.

[1]
https://github.com/odoo/enterprise/blob/ce9eed675db4de3bcd1b283688c5c44d2e1ecf12/l10n_ec_edi/models/account_edi_format.py#L425-L428

**Solution:-**
- Wrapped the access to response and its keys inside a `try...except` block that catches:- 
   - `TypeError`: for cases where the response is `None`.


**Sentry - 6708486009, 6728767866**

Forward-Port-Of: odoo/enterprise#88611