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

Change-Id: I71e7af4ac3043d8d40922e99f8a4798f0993294c
Reviewed-on: https://gerrit.libreoffice.org/71603
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>