deal with invalid json in kaltura partner info

fixes CNVS-10166

Change-Id: Ib69e486332817071e53c2169572514a2d70be4d3
Reviewed-on: https://gerrit.instructure.com/29013
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>
Product-Review: Bracken Mosbacker <bracken@instructure.com>
QA-Review: Bracken Mosbacker <bracken@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>