Revert due to bad formatting "WICKET-5418 properly handle groups in NonNull constraint"

This reverts commit 7bd677ff843fdfece3963e303faaf901aa5ec04b.
Revert due to bad formatting "WICKET-5418 properly handle groups in NonNull constraint"

This reverts commit 49922cdd5ccba3b97c59106d3aea769b8468962e.
WICKET-5418 properly handle groups in NonNull constraint