Did a bit of hacking to get grouping by custom values working again.
Fixed group totals for non custom number values
Made a work packages helper test class and added tests for getRowObjectContent.
Pass display-empty to work package column directive scope as string
Wrap up some work package column directive code in functions
Fix project links in wp table
Added a test class for work packages column directive.
Merge branch 'bug-6360-group-by-unselected-column-fix' of github.com:opf/openproject into bug-6360-group-by-unselected-column-fix
Fixed tests regarding displayEmpty.
Merge pull request #1134 from opf/bug-6360-group-by-unselected-column-fix

Bug 6360 group by unselected column fix