Fix #966: More robust importer against malformed dates

6 jobs for 966-handle-bad-year in 3 minutes and 52 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Review
manual review_docs #35208
docker allowed to fail manual
manual review_front #35207
docker allowed to fail manual
 
  Lint
passed black #35209

00:00:43

passed flake8 #35210

00:00:35

 
  Test
passed test_api #35211
docker

00:03:09

91.0%
passed test_front #35212
docker

00:00:46