Unhandled error when accumulating results for ad-hoc query in server

[tsandall]

The code that accumulates results for ad-hoc queries in the server/REST API is not handling errors correctly (see

opa/server/server.go

Line 351 in ea04f44

if err != nil {

). The error check should happen against e (not err).

As a result, API calls are succeeding when they should be returning an error.