report send cron results in drush / api abnormal termination

I discovered on investigating CRM-12101 another drush / api related problem. Basically for the api to succeed, & hence for drush to succeed it needs to return a result. However, there are 2 obstacles to it returning a result

1) CRM_Core_Report_form line 2380
CRM_Utils_System::redirect(CRM_Utils_System::url(CRM_Utils_System::currentPath(),
'reset=1'
));

& line 2408
2) around line 837 CRM_Utils_System::civiExit();

once again this is a case of the api / cron / drush calling functions written for logged in user display. This is probably a bigger problem than this ticket & warrants it's own ticket for later review.