bkuhl/style-ci-null-value.md

## style-ci-null-value.md

      
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              style-ci-null-value.md
            
          
    The repository in question is 65315616.  We're not using any custom configuration.  My CI is encountering an issue where a unit test, expecting a null value throws a TypeError: Return value of Operator\Telephony\Steps\Voicemail\Builder::prompt() must implement interface Operator\Telephony\Steps\Prompt or be null, none returned
Before StyleCI
    public function prompt() : ?Prompt
    {
        return null;
    }

After StyleCI
    public function prompt() : ?Prompt
    {
    }

What setting am I missing?  I don't see any fixers that control the removal of this return value.