Required Fields for Composer

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Hi All

Just looking for some suggestions as to how I could get fields within a Composer to be required and to not be able to be published until content, what ever it may be image or text etc, is entered.

A draft is OK but final publish must be able to spot the missing field and throw back an error message or a prompt.

Anyone done this before? How did you do it?

Cheers

Alex

madeforspace