Added placeholders across the application

6 jobs for 750-do-not-display-empty-tables-headers in 3 minutes and 28 seconds (queued for 1 second)
Status Job ID Name Coverage
  Review
manual #31959
docker allowed to fail manual
review_docs
manual #31958
docker allowed to fail manual
review_front
 
  Lint
passed #31960
black

00:00:37

passed #31961
flake8

00:00:33

 
  Test
passed #31962
docker
test_api

00:02:51

91.0%
passed #31963
docker
test_front

00:00:49