PIMCORE-2327 - FieldCollections: object_metadata table is not created if object-with-metadata field is added to a fieldcollection but not to the class

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4965 1f8fe7d8-47f0-464c-8d0a-336f4953ab05