How to check null value of a document filed in collection?

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I’m trying to check a null value of the file filed where I have stored PDF files.
I want to check if the file is null or not, if null then it will show a div else it willn’t.

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import wixData from 'wix-data';

$w.onReady(function () {

    const customDiv1 = $w('#columnStrip16');
    customDiv1.hide();

    $w('#button3').onClick(async function () {
        const query = wixData.query('JCMathsWorkedSolutions'); 
        query.find().
            then((results) => {             
                if (results.items.length > 0 && results.items[0].File) {
                    console.log(results.items[0].File);
                    console.log('File is not empty');
                } else {                    
                    console.log('File is empty');                            
                    customDiv1.show();                           
                    setTimeout(() => {
                    customDiv1.hide();
                    }, 1000);                    
                }
            });
    });
});

How can I fix it?