I generated a couple of canned reports in 5.4.3.0, looked for the IDs of them in https://hostname/api/reports?expand=resources and then based on ID, I did https://hostname/api/reports/<id>/results , where I found a list of results and when I opened a particular result with https://hostname/api/reports/<id>/results/<id> I saw a JSON that looks like table data. \o/
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-1916.html