Extra comma appears in a bib entry with just two authors

[pareek21]

Here is an example from the default Einstein page. Any ideas on how to fix this?

[george-gca]

Probably this line is the responsible

al-folio/_layouts/bib.liquid

Line 81 in 47ed26f

{% if forloop.first == false %}, {% endif %}

Looking at it it adds the comma if it is not the first author, but nowhere it looked if there are only 2. Would you mind sending a PR for this?