jwt command with invalid appid still creates/outputs a jwt

[superchilled]

Running the vonage jwt command with the app_id flag set to an invalid app id still creates/ outputs a jwt. Not sure what the expected behaviour is here, but a possible improvement might be to check the validity of the app id first.

[kellyjandrews]

This isn't ideal, no - but it just means it's unauthenticated. We can look at adding checks like this in the future.

[manchuck]

@superchilled I cannot reproduce. can you confirm if you're still having this issue with the latest version of the CLi