object localized fields: always pass the data through preGetData() even when the value is null or the language does not exist yet

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2706 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
objects: warning in lazy loading enabled data types, that this feature isn't available in LF, FC, OB

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2707 1f8fe7d8-47f0-464c-8d0a-336f4953ab05