PIMCORE-2169 - Allowed Document Type Restriction not working if type list is empty

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4275 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (3073) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@4276 1f8fe7d8-47f0-464c-8d0a-336f4953ab05