#5110 - better BV availability check

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8814 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
added BV dependency

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@8815 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c