Fix type annotation errors in virtual_authenticator.py and errorhandler.py (partially addresses #15697)

Author: Paresh-0007

py/selenium/webdriver/common/virtual_authenticator.py

@@ -180,7 +180,9 @@ def to_dict(self) -> dict[str, Any]:
     def from_dict(cls, data: dict[str, Any]) -> "Credential":
         _id = urlsafe_b64decode(f"{data['credentialId']}==")
         is_resident_credential = bool(data["isResidentCredential"])
-        rp_id = data.get("rpId", None)
+        if "rpId" not in data:
+            raise KeyError("Missing required field 'rpId' in credential data.")
+        rp_id = data["rpId"]
         private_key = urlsafe_b64decode(f"{data['privateKey']}==")
         sign_count = int(data["signCount"])
         user_handle = urlsafe_b64decode(f"{data['userHandle']}==") if data.get("userHandle", None) else None

py/selenium/webdriver/remote/errorhandler.py

@@ -173,7 +173,10 @@ def check_response(self, response: dict[str, Any]) -> None:
                             message = value.get("value") or value.get("message")
                             if not isinstance(message, str):
                                 value = message
-                                message = message.get("message")
+                                if isinstance(message, dict):
+                                    message = message.get("message")
+                                else:
+                                    message = None
                         else:
                             message = value.get("message", None)
                 except ValueError:
@@ -202,7 +205,9 @@ def check_response(self, response: dict[str, Any]) -> None:
             screen = value["screen"]
 
         stacktrace = None
-        st_value = value.get("stackTrace") or value.get("stacktrace")
+        st_value = None
+        if isinstance(value, dict):
+            st_value = value.get("stackTrace") or value.get("stacktrace")
         if st_value:
             if isinstance(st_value, str):
                 stacktrace = st_value.split("\n")