[Possbile minor bug in WebUI - adding same token multiple times even with same username is possible]

Hi Cornelius,
hi List,

I think I found a small “bug” in the WebUI.

When you attach token to a machine you can do it multiple times with the
same token.
In my opinion, the WebUI should not show the token in the select box if
already assigned.

If it is by design, that a token can be added multiple times (because
you can use it with a different username),
it should NOT be possible to add it again with the same username, right?

Kind regards

Peter M.

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