Remove some boilerplate with get_object_or_404 to lookup the uuids for the Study and Child.
Remove some boilerplate with get_object_or_404 to lookup the uuids for the Study and Child.

pattisdr/lookit-api,CenterForOpenScience/lookit-api,pattisdr/lookit-api,CenterForOpenScience/lookit-api,pattisdr/lookit-api,CenterForOpenScience/lookit-api