Merge pull request #1828 from akeneo/PIM-3326-stable

Pim 3326 stable: Fix mongo filters with multiples values and empty
PIM-3426: Fix edit common attributes
Merge pull request #1820 from akeneo/PIM-3426

PIM-3426: Fix edit common attributes
Merge branch '1.2' into stable-PIM-3426
PIM-3426: Adapt behat to master
Merge pull request #1837 from akeneo/stable-PIM-3426

Stable pim 3426