Sending stop method to marketmaker should return a response

[sindresorhus]

From curl:

❯ curl --url "http://127.0.0.1:51129" --data "{\"userpass\":\"xx\",\"method\":\"stop\"}"
curl: (52) Empty reply from server

Seems like marketmaker stops before it has time to reply.

Not sending a response is a bit annoying as the response throws in Chrome and exits with code 1 with curl.

From Chrome:

api.js:12 POST http://localhost:54928/ net::ERR_EMPTY_RESPONSE

[jl777]

good point! it started out as just a debug thing, but I will make it behave nicer

ok,pushed fix to dev branch. thanks for bug report!