Undefined does not work after correction

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Your CODE and your description do not fit together.
Where did you place your buttons and checkboxes?
Can you show a screenshot of your constalation?

This here hides all your buttons emidiately when no data found for each datafield(data-column) in your DATABASE, when REPEATER is READY.

$w.onReady(function () {
    $w("#repeater1").onItemReady(($item, itemData, index) => {
        console.log(itemData.pdf); 
        if(itemData.pdf === undefined )         {$item("#button1").hide();}
        if(itemData.labelnew1 === undefined )   {$item("#button3").hide();}
        if(itemData.labelbukken === undefined ) {$item("#button4").hide();}
    });
});

What next ?