Check if the cells are not blank

I have attempted to alter this example to simply check if the cells are not blank by replacing the "X" with "<>", but I get errors in the SMALL function--it looks like the IF statement is just returning an array with all of the values set to FALSE, and none of the values in the array call out a location of the next filled cell.

How could you alter your fixed XLSX file to check for non-blank cells instead of "X" specifically?

Thanks,

Micah