No AV default keyword for Besancon query?

Hey I am trying to query the Besancon model and so far everything works very well. Only when I want to pass a cloud to the "clouds" keyword I get an error:

kwd['AV'][ii] = AV
KeyError: 'AV'

I think this is because there is no default keyword defined in core.py, right?
If this is not the issue, please let me know how to pass a single cloud to the query. 😊

thanks