fixed NPE (initial case)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2161 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
content analysis: social media overview report

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2162 1f8fe7d8-47f0-464c-8d0a-336f4953ab05