Empty "Bronnen"

For some answers, there are no citations. For those articles there is an empty part under 'Bronnen'. See for example [this page](https://www.klimaathelpdesk.org/answers/gaat-het-ijs-op-de-noord-en-zuidpool-helemaal-verdwijnen/).
Since I think that not having sources is in itself not very nice, it might be good not to attract any attention to it by showing an empty list of sources :p

Start by opening the linked article and tracing the website entry point that renders its “Bronnen” section. Confirm how an answer with no citations is handled, then verify that the empty section is absent while pages with citations still show their sources.

Written by the indexing model from the issue text.