send report api function exits rather than returning (this can mess up scheduled jobs)

In the endPostProcess if
if ($this->_sendmail) {

then after sending the mail it redirects
CRM_Utils_System::redirect(CRM_Utils_System::url(CRM_Utils_System::currentPath(), 'reset=1'));

Since send mail ONLY happens in a job as far as I know this behaviour is ALWAYS inappropriate & can derail a php process (e.g running all scheduled jobs).

Replacing the above with 'return' seems to help - in that the redirect no longer happens - although I still get html output when calling from drush (not sure why)