Make error_location optional

Author: stephen-zhao

trino/exceptions.py

@@ -108,9 +108,9 @@ def message(self) -> str:
         return self._error.get("message", "Trino did not return an error message")
 
     @property
-    def error_location(self) -> Tuple[int, int]:
-        location = self._error["errorLocation"]
-        return (location["lineNumber"], location["columnNumber"])
+    def error_location(self) -> Optional[Tuple[int, int]]:
+        location = self._error.get("errorLocation", None)
+        return (location["lineNumber"], location["columnNumber"]) if location else None
 
     @property
     def query_id(self) -> Optional[str]: