Merge pull request #4871 from eileenmcnaughton/CRM-15795

 CRM-15795 prevent silent failure with rollback on participants

diff --cc CRM/Member/Form/MembershipRenewal.php
Simple merge

diff --cc api/v3/Participant.php
index 790b3d16f09c25bdd66dce741242b36f2d0315bb,9a20b2f1ddb6700f72dda15242e543cbbf1a721c..55fb5f60c84084883e97e7ea23afa92ef939242f
--- 1/api/v3/Participant.php
--- 2/api/v3/Participant.php
+++ b/api/v3/Participant.php
@@@ -79,9 -79,10 +79,10 @@@ function civicrm_api3_participant_creat
  }
  
  /**
+  * @todo this should be done in the BAO not the api
   * Create a default participant line item
   */
 -function _civicrm_api3_participant_createlineitem(&$params, $participant){
 +function _civicrm_api3_participant_createlineitem(&$params, $participant) {
    // it is possible that a fee level contains information about multiple
    // price field values.