fix referenced before assignment problems

Author: fat-catTW

airflow-core/src/airflow/api_fastapi/common/exceptions.py

@@ -179,12 +179,14 @@ def __init__(self):
     def exception_handler(self, request: Request, exc: SQLAlchemyError):
         exception_id = get_random_string()
         stacktrace = "".join(traceback.format_tb(exc.__traceback__))
+        statement = getattr(exc, "statement", "hidden")
+        orig_error = getattr(exc, "orig", "hidden")
         # SQLAlchemyError may not have statement/orig attributes; guard access
         log.exception("Error with id %s, statement: %s", exception_id, statement, exc_info=exc)
         if conf.get("api", "expose_stacktrace") == "True":
             message = f"Error with id {exception_id}, statement: {statement}\n{stacktrace}"
-            statement = getattr(exc, "statement", None)
-            orig_error = getattr(exc, "orig", None)
+            statement = str(statement)
+            orig_error = str(orig_error)
         else:
             message = (
                 "Serious error when handling your request. Check logs for more details - "