CRM-15197 - Fix for WebTest_Event_AddParticipationTest::testEventAddMultipleParticipants

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* CRM-15197:
  https://issues.civicrm.org/jira/browse/CRM-15197
Merge pull request #3977 from davecivicrm/CRM-15197

CRM-15197 - Fix for WebTest_Event_AddParticipationTest::testEventAddMult...