Avoid warnings in config loading

4 jobs for config-loading-warning-py37 in 3 minutes and 2 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #213880
docker
build_linux_36

00:02:59

73.0%
passed #213881
docker
build_linux_37

00:02:59

73.0%
passed #213878
macosx
build_macosx_36

00:02:53

74.0%
passed #213879
macosx
build_macosx_37

00:02:49

74.0%