PIM-3533 Avoid normalizing empty price collections to prevent wrong keys
PIM-3533 Update changelog
Merge pull request #1912 from akeneo/PIM-3533

PIM-3533 Avoid normalizing empty price collections to prevent wrong keys
PIM-3533 Add a migration script for incorrectly built versions
Merge pull request #1917 from akeneo/PIM-3533

PIM-3533 Add a migration script for incorrectly built versions
Merge branch '1.2' into merge-1218

Conflicts:
	CHANGELOG.md
	src/Pim/Bundle/TransformBundle/Normalizer/Flat/ProductValueNormalizer.php
PIM-3533 Allow extra options in denormalizer context
Merge pull request #1922 from akeneo/merge-1218

Merge 1.2.18 fixes on master