Similar to clang-tidy readability-container-size-empty

Change-Id: I81c0ff78d2ecc7d984e3ed5e5ce60efe327fc162
Reviewed-on: https://gerrit.libreoffice.org/71799
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>