Improve logging of exceptions from sys.exc_info

server/lib/python/cartodb_services/cartodb_services/tools/log.py

@@ -86,7 +86,14 @@ class Logger:
                 self._file_logger.error(text, extra=extra_data)
 
     def _send_to_plpy(self, level, text, exception=None):
-        exception_message = '. Exception: {}'.format(str(exception)) if exception else ''
+        # exception might also be a tuple generated by sys.exc_info
+        if exception:
+            if isinstance(exception, tuple) and len(exception) > 1:
+                exception = exception[1]
+            exception_message = '. Exception: {}'.format(exception)
+        else:
+            exception_message = ''
+
         message = '{}{}'.format(text, exception_message)
         if self._check_plpy():
             if level == 'debug':