add omitempty to authorization.auth_users

[caleblloyd]

In account claims, authorization is a struct so it always gets serialized even though it has omitempty

And since authorization.auth_users doesn't currently have omitempty, by default that always gets serialized to null

So every account JWT by default is ending up with:

  "nats": {
    "authorization": {
      "auth_users": null
    },
    ...
}

After this change, it will be:

  "nats": {
    "authorization": {},
    ...
}

To get rid of the empty authorization field, we would have to change Account.Authorization to a Pointer

[coveralls]

Pull Request Test Coverage Report for Build 7935547480

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.042%

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Totals
Change from base Build 7919651659:	0.0%
Covered Lines:	2723
Relevant Lines:	3360

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💛 - Coveralls

[derekcollison]

LGTM

[aricart]

LGTM