Forcesell is not working

[vertti]

Forcesell command executes the sell correctly but then the trade handling loop continues like the sell never happened:

2017-09-08 18:59:47,133 - rpc.telegram - INFO - Executing handler: _forcesell for chat_id: --removed--
2017-09-08 18:59:48,989 - rpc.telegram - INFO - *BITTREX:* Selling [BTC/NXS](https://bittrex.com/Market/Index?MarketName=BTC-NXS) at rate `0.000716 (profit: -0.44%)`
2017-09-08 18:59:54,339 - main - DEBUG - Handling open trade Trade(id=1, pair=BTC_NXS, amount=4.169098640873843, open_rate=0.00071958, open_since=225.63) ...
2017-09-08 18:59:55,134 - main - DEBUG - Threshold not reached. (cur_profit: -0.44%)

Checking Bittrex, the sell went through but that last line (Handling open trade) keeps appearing. As the forcesell operation does nothing else than call bittrex and update the persistence, I have a feeling that #10 might have broken it.

[gcarq]

I'm implementing a test for forcesell on develop right now, lets see if I can reproduce it.

[shusso]

@gcarq most likely I broke it with #10 Let me know if you need me to revert it

[gcarq]

The linked commit should fix this issue. I think manually flushing has to be done when writing data on a different thread, it seems that autoflush has no effect here.