only check widgetVar==Id on Development stage

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9891 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
fixed tests

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9892 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
possible NPE

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@9893 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c