[0.11.1]: admin UI does not provide any feedback for successful but empty queries

[jonseymour]

Bug report

System info:

influxdb: 0.11.1 (local build)
operating systemn: ubuntu 14.04.4

Steps to reproduce:

1. execute a query that is expected to have no results: select * from "database" where numSeries < 0

Expected behavior: [What you expected to happen]

A success message should be displayed, indicating that the query was accepted and processed successfully but no results were returned.

Actual behavior: [What actually happened]

No results are displayed and no feedback is available to indicate to the user that the query was even accepted. Previously a green success message was displayed.

Other examples include:

CREATE DATABASE foobar
DROP DATABASE foobar
SHOW SUBSCRIPTIONS # when there are no subscriptions

The CREATE DATABASE and DROP DATABASE cases also fail to report an error if the database already exists (or does not already exist, respectively).

Additional info:

• when testing different versions, ensure that you have used shift-F5 to ensure the browser reloads the JavaScript resources from the server
• the issue appears to have been introduced between v0.10.3 and v0.11.1

[jonseymour]

I bisected the commit that caused this issue down to 0cd440e. /cc @toddboom

[jonseymour]

Fixed by #6194.

[toddboom]

@jonseymour Thanks for taking care of this! I've merged your PR into master and 0.12, so future releases off of those branches will have this. I'll go ahead and merge it into the 0.11 branch, but we don't currently have any plans to cut another point release in the 0.11.x line.