Merge branch 'master' of https://github.com/molgenis/molgenis
Merge branch 'master' of https://github.com/molgenis/molgenis
Merge branch 'master' of https://github.com/molgenis/molgenis
M2838 Add null column to aggregates for nillable attributes
Remove old non-working tests (todo: replace with new tests)
Merge pull request #1939 from dennishendriksen/master

M2838 Add null column to aggregates for nillable attributes