[fix] Handle empty lists in check_parameters.

2 jobs for fix-check-params in 2 minutes and 38 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #219129
docker
build_linux_37

00:02:33

55.0%
passed #219128
macosx
build_macosx_37

00:02:29

55.0%