TypeError: object of type 'NoneType' has no len()

This happens when the SSID and Password are not present in `settings.toml` .
* Hardwarte used:
Adafruit CircuitPython 9.2.4 on 2025-01-28; Adafruit PyPortal Titano with samd51j20
Firmware vers. 2.0.0-rc.0+adafruit

```python
Connecting to AP...
Traceback (most recent call last):
File "", line 1, in
File "conexion.py", line 66, in
File "adafruit_esp32spi/adafruit_esp32spi.py", line 690, in connect_AP
File "adafruit_esp32spi/adafruit_esp32spi.py", line 558, in wifi_set_network
File "adafruit_esp32spi/adafruit_esp32spi.py", line 429, in _send_command_get_response
File "adafruit_esp32spi/adafruit_esp32spi.py", line 307, in _send_command
TypeError: object of type 'NoneType' has no len()

```

for reference: @justmobilize

Start with adafruit_esp32spi/adafruit_esp32spi.py at connect_AP, wifi_set_network, and _send_command_get_response, using the reported traceback and the missing SSID/password in settings.toml as the reproduction. Determine the expected behavior when either value is absent, then verify that the resulting handling no longer raises this TypeError.

Written by the indexing model from the issue text.