mgr/snap-schedule: use the right way to check the result returned by fetchone()

Fixes: https://tracker.ceph.com/issues/57138
Signed-off-by: Mer Xuanyi <xuanyi.meng@xtaotech.com>
(cherry picked from commit ac5f64e86b53a84bfd649d8f35553aff50803898)

diff --git a/src/pybind/mgr/snap_schedule/fs/schedule.py b/src/pybind/mgr/snap_schedule/fs/schedule.py
index 773a0694af9ae39f1d314070977b4a100ec7f3b8..182d8a28d6851060fed63b913620b62675072967 100644 (file)
--- a/src/pybind/mgr/snap_schedule/fs/schedule.py
+++ b/src/pybind/mgr/snap_schedule/fs/schedule.py
@@ -282,7 +282,7 @@ class Schedule(object):
                              (path,))
             row = cur.fetchone()
 
-            if len(row) == 0:
+            if row is None:
                 log.info(f'no schedule for {path} found')
                 raise ValueError('SnapSchedule for {} not found'.format(path))