fix(cli): fix cli_tests made by #2574

[salaheldinsoliman]

Description of change

My pr #2574 caused some failures in cli_tests. The main problem was caused by marking emit as not required, while not wrapping it in an Option. So, clap assumed it to be required

Links to any relevant issues

fixes #3968

Type of change

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• Bug fix (a non-breaking change which fixes an issue)

How the change has been tested

cli_tests ran locally

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes