Return errors in CSV responses

[connor4312]

Required for all non-trivial PRs

• Rebased/mergable
• Tests pass
• CHANGELOG.md updated
• Sign CLA (if not already signed)

Previously, errors that happen when asking for CSV responses would be eaten; a 400 response would be sent back, but the body would be blank without any details returned to the caller. This modifies the writer to return an error if one occurred. For example:

$ curl -s localhost:8086/query --data-urlencode db=influx_test_db --data-urlencode "q=select * from h2o_quality limit wut" -H Accept:'text/csv'
error
"error parsing query: found wut, expected integer at line 1, char 33"

[jsternberg]

Can you rebase this and put this as a bugfix for 1.3? Thanks.

[jsternberg]

Also feel free to give yourself some credit in the changelog. Something like "Thanks ." You can see other examples in the changelog.

[jsternberg]

Ping.

[jsternberg]

@connor4312 I'm going to rebase your change for you so this can be merged. I hope that's OK. Thank you for your contribution.

[connor4312]

Sure. Sorry for the lack of followup. Let me know if you'd like me to do anything further here.

[jsternberg]

No problem! All merged now. Whenever we do a 1.4, it will be included.

[connor4312]

Awesome, thanks!