PIMCORE-1998 - newsletter subscribe function tries to create objects with invalid key

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3157 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3158 1f8fe7d8-47f0-464c-8d0a-336f4953ab05