Find Participant errors when Event not specified.

If you try to run Find Participants but do not specify an event, CiviCRM errors with:

<div id="crm-container" class="crm-container" lang="en" xml:lang="en"> <style type="text/css" media="screen"> @import url(/administrator/components/com_civicrm/civicrm/css/civicrm.css); @import url(/administrator/components/com_civicrm/civicrm/bower_components/jquery-ui/themes/smoothness/jquery-ui.min.css); </style> <div class="messages status no-popup"> <div class="icon red-icon ui-icon-alert"></div> <span class="status-fatal">Sorry but we are not able to provide this at the moment.</span> <div class="crm-section crm-error-message">'' is not a valid option for field id</div> <p><a href="https://livetest.missionassist.org.uk/administrator/" title="Main Menu">Return to home page.</a></p> </div> </div> <script language="JavaScript"> function toggle( element ) { var className = element.className; if ( className == 'crm-accordion-wrapper collapsed crm-fatal-error-details-block')

{ element.className = 'crm-accordion-wrapper crm-fatal-error-details-block'; }

else

{ element.className = 'crm-accordion-wrapper collapsed crm-fatal-error-details-block'; }

} </script>

I could not reproduce it in Demo, but Demo is running 4.6.0, not 4.6.2. I propose to investigate further but thought I should flag it up.