Remove useless code on family and group filters
PIM-2440: Allow filtering by empty family
Merge branch 'PIM-2440' of github.com:akeneo/pim-community-dev into PIM-2440
PIM-2440: Make entity filter works with empty family
PIM-2440: Add behat scenarios for family filtering on empty value
Merge branch 'PIM-2440' of github.com:akeneo/pim-community-dev into PIM-2440
PIM-2440: Reorder methods
Merge branch 'master' into PIM-2440
Merge pull request #1052 from akeneo/PIM-2440

PIM-2440: Filter by empty family