The reason for accepting empty attribute was eliminated in commit
2f91ab025d (Merge two assertXPath
overloads that both check number of nodes, Nov 25 16:36:57 2022)
Change-Id: I6cd77eb0f73650dfdafd55946b5269ffe3f0bde5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/143304
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>