small fix

funbringer · funbringer · commit 71d0af07f18e · 2017-11-24T13:53:16.000+03:00
diff --git a/testgres/testgres.py b/testgres/testgres.py
@@ -868,8 +868,7 @@ def safe_psql(self, dbname, query, username=None):
 
         ret, out, err = self.psql(dbname, query, username=username)
         if ret:
-            if err:
-                err = err.decode('utf-8')
+            err = '' if not err else err.decode('utf-8')
             raise QueryException(err)
         return out
 
