error handling need when no value provided for "output format"

[gregorybrzeski]

Running of h1-cli without a value for --output / -o needs better error handling.

Preferably information that values is missing or is not from allowed set of options. Would be nice if possible options were shown in error message as well like in --help.

$ ./h1 iam project list -o 
TypeError: formatter is not a function
    at Object.opts.format (webpack:///../cli-core/plugin/formatOutput.js?:95:20)
    at Command.handler (webpack:////home/runner/work/h1-cli/h1-cli/extensions/cli-ext-root-openapi-generator/index.js?:95:25)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)