Add more None checks

Author: stephen-zhao

Diff for: trino/exceptions.py

@@ -110,7 +110,13 @@ def message(self) -> str:
     @property
     def error_location(self) -> Optional[Tuple[int, int]]:
         location = self._error.get("errorLocation", None)
-        return (location["lineNumber"], location["columnNumber"]) if location else None
+        if location is None:
+            return None
+        line_number = location.get("lineNumber", None)
+        column_number = location.get("columnNumber", None)
+        if line_number is None or column_number is None:
+            return None
+        return (line_number, column_number)
 
     @property
     def query_id(self) -> Optional[str]: