CLOUD-2167: Notification emails for assigned tasks are not populated correctly
NOTE: If no message is supplied the task type is used as the description rather than empty string in the email notification. Also fixed the task type display for "simple cloud task", now shows "Task" and not "Review".
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@57957 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261