Smart groups as a criteria fatal error reports

If you set a group filter in a report and you set one or more of the groups to be a smart group, there's a fatal error. I tracked down the problem to line 81 of Contact/BAO/GroupContactCache.php it's a minor change to fix…

$groupIDString = CRM_CORE_DAO::escapeString(implode(', ', $groupID));

is missing an 's' on the variable name

$groupIDString = CRM_CORE_DAO::escapeString(implode(', ', $groupIDs));

makes everything work fine.