Only a subset of unillustrated articles (with and without recommendations) is saved.
A filtering step in the post-processing of results is excluding a subset of unillustrated articles that
have no recommendation.
This bug was initially reported at https://phabricator.wikimedia.org/T277875#6948836
Steps to Reproduce:
Run the algorithm.py notebook with cebwiki and snapshot 2021-02
The output file contains 117255 records
The output file should contain 1435202 records.