Suggestion to add an optional no results found row when rendering as HTML.

[aNorthernSoul]

It would be nice to have an option to have the renderRowHtml output a row with a configurable message if no results were found. For example, in the renderRowHtml function, you could simply do something like:

`
private function renderRowHtml()
{
$data = $this->getTable()->getData();
$headers = $this->getTable()->getHeaders();
$render = '';

    if ( !sizeof($data) ) {
        return sprintf('<tr %s><td colspan="%s">%s</td></tr>', $this->getAttributes(), sizeof($this->getTable()->getHeaders()), 'There is no data to display.');
    }
    
    foreach ($data as $rowData) {
        $this->setActualRow($rowData);
        $rowRender = '';

        foreach ($headers as $name => $options) {
            $rowRender .= $this->getTable()->getHeader($name)->getCell()->render('html');
        }

        foreach ($this->decorators as $decorator) {
            $decorator->render('');
        }

        $render .= sprintf('<tr %s>%s</tr>', $this->getAttributes(), $rowRender);
        $this->clearVar();
    }
    return $render;

}
`

Ideally the message could be set in the table class extending AbstractTable so that it could be unique to each table but even the above would be handy.