content view - handle case where task is nil

Under certain error conditions, it is possible that the
task is nil when this partial is rendered.  Handle that case
without generating error.
content views - add notices for the start/end of publish/refresh

Minor updates to generate a notice when a publish/refresh
is initiated as well as when it completes (success or failure).
Merge pull request #1338 from bbuckingham/fork_content_views

content views - add notices for the start/end of publish/refresh