Rescue an exception around the documentation tasks as it does not work on our ci infrastructure
Rescue an exception around the documentation tasks as it does not work on our ci infrastructure

git-svn-id: d8f3215415546ce936cf3b822120ca56e5ebeaa0@1395508 13f79535-47bb-0310-9956-ffa450edef68

stewi2/buildr,mariusk/buildr-kawa,jpcaruana/buildr,apache/buildr,liamchristopher/buildr,mariusk/buildr-kawa,liamchristopher/buildr,jpcaruana/buildr,stewi2/buildr,liamchristopher/buildr,apache/buildr,stewi2/buildr,stewi2/buildr,jpcaruana/buildr,liamchristopher/buildr,mariusk/buildr-kawa,apache/buildr,apache/buildr,jpcaruana/buildr