CMT packages (subdirectories) ignored by "git lb-checkout"

The changes introduced in git-lb-checkout with !5 (merged) consider only the CMake case, thus make the tool unusable for CMT builds.

This example fails saying that Event/EventBase is not a valid package.

git init test_dir
cd test_dir
git lb-use LHCb
git lb-checkout LHCb/reco14-patches Event/EventBase

See https://lhcb-talk.web.cern.ch/t/how-to-locally-install-a-nightly-slot-not-available-on-cvmfs/254