New enotice (in 4.7.10 - possibly introduced in 4.7.9 CRM-18656

When I search (on latest master) for tags in advanced search I get an enotice because the line added in the optimisation

$parentId = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_Tag', $tagId, 'parent_id');

is passing an array ($tagId) rather than a string to a function that expects a string

Not sure if that was the case when the line was added (for 4.7.9 in CRM-18656 ) or it has regressed over the past 20 days