Some empty functional annotations are reported by the API #27
Description
Sometimes, an empty functional annotation (in the format EC: or IPR:) is reported by the Unipept API. This causes downstream analysis of these samples to come up with weird or incomplete visualizations. After some initial investigation, I can see that these functional annotations are reported by the mpa/pept2data endpoint, so the issue is probably already the result from a parsing error when constructing the Unipept Database.
An example peptide for which this issue occurs is for example AAAALTER.