Jinja2 'group' variable

This is more a question than an issue, but I was wondering how the 'group' Jinja variable in the conda/meta.yaml template is handled here (https://gitlab.idiap.ch/bob/bob.devtools/blob/master/bob/devtools/templates/conda/meta.yaml#L55).

I'm asking because it took me quite some time to figure out why the CI was failing ...