/queryplan returns HTTP 204

I was able to successfully get the SQL from one report.  Upon trying it on the second report:

GET /biprws/raylight/v1/documents/316875/dataproviders/DP0/queryplan

I get:

HTTP/1.1 204 No Content

Date: Fri, 26 Feb 2016 21:42:45 GMT

Server: Apache-Coyote/1.1

Content-Type: text/xml

Content-Length: 0

Keep-Alive: timeout=5, max=88

Connection: Keep-Alive

I was able to open the report in WebI and view the SQL, so there is nothing wrong with the report.