fix metrics-http-json when used without --object

[mrooney]

Pull Request Checklist

Is this in reference to an existing issue? It is not.

General

• [x] Update Changelog following the conventions laid out on Keep A Changelog
• [X] Update README with any necessary configuration snippets
• [X] Binstubs are created if needed
• [x] RuboCop passes (well, it doesn't pass on master. None of the offenses are related to my changes though. Would be nice if this passed on master :)
• [x] Existing tests pass (Travis build is failing on master so they aren't going to pass here :)

  Purpose

Presently, both blocks are inside the unless, and so if you don't specify an object, it never grabs any metrics. This maintains the original behavior of doing both scans/outputs if you do specify an object, but if that is also a bug, then this should be an if/else.

Known Compatablity Issues

[boutetnico]

this patch helped me, thanks!

[mrooney]

Any possibility of a review @sstarcher @eheydrick? :)

[mrooney]

Thanks so much @sstarcher ! Any plans to make a new release to rubygems?

[eheydrick]

We need to fix the build then we can cut a new release. Looks like something may have broke with test-kitchen. I will investigate.