py3 branch: client crash due to invalid JSON

[rekado]

I'm using the py3 branch with the tedlium_nnet_ms_sp_online model. I'm running this on the Bill Gates TED talk mp3. Is recognizes the first few characters but then crashes:

Received message ...
{"status": 0, "segment": 1, "result": {"hypotheses": [{"transcript": "that"s why."}], "final": false}, "id": "ad00b3f2-8787-4d13-9b53-efdd0547c941"}

ERROR:tornado.application:Uncaught exception Expecting ',' delimiter: line 1 column 76 (char 75)

The problem is that the JSON is invalid. There's a double quote instead of a single quote in that"s why.

[rekado]

I don't see anything wrong in the worker log output. The transcript looks fine there.

[rekado]

I guess the problem is in master_server.py in send_event:

self.write_message(json.dumps(event).replace('False', 'false').replace('\'', '\"'))

I wonder why this was deemed necessary.

[rekado]

Removing that final replacement fixes things for me.