renderer: 'html' and minSpareRows is inserting 'null' into new cells.

[djseng]

Here is a fiddle that reproduces the issue. http://jsfiddle.net/ao26oekz/14/

[AMBudnik]

Thank you @djseng confirmed
null values are gone partly where we type something into the cell like <a href="#">a</a>

[djseng]

I'm using the following renderer temporarily:

function cleanHtmlRenderer(instance, td, row, col, prop, value, cellProperties){
    Handsontable.renderers.HtmlRenderer.apply(this, arguments);
    if (td.innerHTML === 'null') {
        td.innerHTML = '';
    }
}