Databank exception problem

```
when databank raises an error
the modbus server sends a malformed message

I think the issue is due to a malformed pdu
at the end of Databank.handle_request
maybe a query.build_response should be called to wrap the response

f


```

Original issue reported on code.google.com by `dr.sh...@gmail.com` on 19 Nov 2012 at 3:07
