PIM-2840: Separate events for tree and category
PIM-2840: Use event subscriber to check channels linked to category
PIM-2840: Update phpdoc
Merge branch 'master' into PIM-2840
Merge branch 'PIM-2840' of github.com:akeneo/pim-community-dev into PIM-2840
Merge pull request #1226 from akeneo/PIM-2840

PIM-2840: Clean code when remove a category