Merge branch 'NIFTy_4' into yango_minimizer

needed hotfix from master
2 jobs for yango_minimizer in 1 minute and 47 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #538054
test_python2_scalar

00:01:47

67.0%
passed #538055
test_python3_scalar

00:01:15