the computationrefs endpoint is giving me a 404 not found error in opentsdb

[wjonassen]

Describe the bug
I am doing a "get" on the computationrefs endpoint and I am getting a 404 error. It's also giving me a response of
{
"message": "No computations found matching the filter criteria"
}

To Reproduce
Steps to reproduce the behavior:
In opentsdb, hit the computationrefs endpoint.
I am getting a 404 with the following json response:
{
"message": "No computations found matching the filter criteria"
}

I know I have seen this successful in the CWMS version, so maybe it's an opentsdb only bug? Or possibly an environment specific issue. Feel free to ping me and we can debug it on my system if needed.

Expected behavior
It should return the computation references in json format.

[adamkorynta]

Sending to @wjonassen for testing.