Validate wifi credentials

Author: relic-se

adafruit_portalbase/network.py

@@ -385,6 +385,14 @@ def connect(self, max_attempts=10):
                     raise TypeError(
                         "'networks' must be a list/tuple of dicts of 'ssid' and 'password'"
                     )
+            
+            self._wifi_credentials = list(filter(
+                lambda credentials: isinstance(credentials, (list, tuple)) and "ssid" in credentials and "password" in credentials and type(credentials["ssid"]) is str and type(credentials["password"]) is str and len(credentials["ssid"]) and len(credentials["password"]),
+                self._wifi_credentials
+            ))
+            if not len(self._wifi_credentials):
+                self._wifi_credentials = None
+                raise OSError("No valid wifi credentials provided")
 
         for credentials in self._wifi_credentials:
             self._wifi.neo_status(STATUS_CONNECTING)