Test failure.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11224 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed that adding a blank/invalid block to my page renders a blank page (#12838).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11225 e93f8b46-1217-0410-a6f0-8f06a7374b81