Improve messaging when a user is not logged in

[plumbis]

What problem are you facing?

When a user is not logged in and runs up commands the error returned is no default profile specified

$ up ctp list
Usage: up controlplane list

List control planes for the account.

Flags:
  -h, --help                               Show context-sensitive help.
  -v, --version                            Print version and exit.

      --endpoint=https://api.upbound.io    Endpoint used for Upbound API ($UP_ENDPOINT).
      --profile=STRING                     Profile used to execute command ($UP_PROFILE).
  -a, --account=STRING                     Account used to execute command ($UP_ACCOUNT).

up: error: no default profile specified

The problem is the documentation indicates the profile is auto generated when you login. If you foolishly think you are logged in (for example, changing linux users after login) this gives you no indication of what your problem is.

How could Upbound help solve your problem?

When no profile is specified, as indicated by the error, either check if the user is logged in or expand the error message to suggest that maybe they aren't logged in.