若谷歌电子表格中的单元格值为0,则删除该行

function readRows() {
    var sheet = SpreadsheetApp.getActiveSheet();
    var rows = sheet.getDataRange();
    var numRows = rows.getNumRows();
    var values = rows.getValues();

    var rowsDeleted = 0;
    for (var i = 0; i <= numRows - 1; i++) {
        var row = values[i];
        if (row[4] == 0) {
            sheet.deleteRow((parseInt(i) + 1) - rowsDeleted);
            rowsDeleted++;
        }
    }
}

但是这个脚本也会删除带有空值的行,我想忽略这些空值