Merge branch 'checkstyle' into 'develop'

Fix checkstyle warnings

See merge request !196
5 jobs for develop in 24 minutes and 28 seconds (queued for 20 seconds)
Status Name Job ID Coverage
  Verify
passed verify #2649

00:22:11

 
  Visualize
passed coverage-import #2650

00:00:28

97.0%
 
  Deploy
passed deploy:artifacts #2651

00:01:18

passed deploy:site #2652

00:00:30

passed performance