How to check if a nodelist has an element with no content in it?

I want my function to check if there is an element with no content in it first, then if the condition is true- execute the code, else don't run the function. I just don't know how to check whether there is an element with no content in it.

function randomBlock(){
    let random = Math.floor(Math.random() * blocks.length)
    if(blocks[random].textContent == ""){
        blocks[random].textContent = "O"
    } else{
        randomBlock()
    } 
}