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 Job ID Name Coverage
  Review
manual #35208
docker allowed to fail manual
review_docs
manual #35207
docker allowed to fail manual
review_front
 
  Lint
passed #35209
black

00:00:43

passed #35210
flake8

00:00:35

 
  Test
passed #35211
docker
test_api

00:03:09

91.0%
passed #35212
docker
test_front

00:00:46