Espressif wifi trying to connect to secure wifi with no password unknown error 15

[bill88t]

CircuitPython version

master, on regular esp32

Code/REPL

import wifi
wifi.radio.connect("wpa2wifiname")

Behavior

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ConnectionError: Unknown failure 15

Description

Network is WPA2, code is trying to connect to it as if it's an open network.

Additional information

This is just a visual issue. A value must just be mapped to that error, indicating what went wrong.

I could fix this myself, but no time. This is a good first issue.
If we get to 9.0-rc0, I'll fix it.