rgw/trim: fix ENOENT return response from bucket sync status query.

rgw/trim: fix ENOENT return response from bucket sync status query.
only handle them when the bucket metadata is deleted. there is a case
when we get enoent when status objects have not been created yet,
for example when bucket metadata is created and synced but no data
exists yet and bucket sync status won't be initialized. these don't
need special handling.

Signed-off-by: Shilpa Jagannath <smanjara@redhat.com>