Fixed npe

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11701 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11702 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fixed #7258

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11703 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c