Hide sidebar blocks that don't contain content

I solved this feature request by writing a little JavaScript program. If you have any comments, please let me know.

Regards, hans

Javascript Program RemoveEmptyTags
======================
/**
Remove empty More like this tag

php-Function in drupal-morelikethis:

function theme_morelikethis_block($items){
if(!$items)
return t('No related items were found.');

Result of the function theme_morelike this:

Situation 1: Content found
--------------------------

More Cool Content You Might Like

• On KPI's and Governmental Organizations (300.0%)
• Sense and Non-Sense of KPI's (200.0%)

...

Situation 2: No content found (or just one reference)
-----------------------------

More Cool Content You Might Like

No related items were found.

Analyis:
-------
1. Find the id of block-morelikethis-taxonomy
2. Find all decendents of the unordered list
3. If there are 2 or more decendents show them, else do not display this block

Remark:
------
The way MoreLikeThis works, selecting the most significant references first,
it could have been an ORDERED list instead of an UNORDERED list.

Implementation:
--------------
I placed this Javascript module in my /sites/themes/r2m directory, and edited
the r2m.info file by adding this line:

scripts[] = RemoveEmptyText.js

Do not forget to empty yous Javascript cache, if you want to show up the
results immediately!
*/

// Create a new namespace for the new Javascript function RemoveEmptyText,
// or reuse the existing namespace
var RemoveEmptyText = RemoveEmptyText || {};

// Define the function
RemoveEmptyText = function () {

// Get the selector
var divBlockMoreLikeThis = $('#block-morelikethis-taxonomy');

// For debugging only: alert("Size=" + $(divBlockMoreLikeThis).find('li').size());

// Check the number of all decendents of the selector:
// 0 : No refences found
// 1 : Just one referefnce, too little
// 2 or more : OK, display the found refences
if ($(divBlockMoreLikeThis).find('li').size() < 2) {
divBlockMoreLikeThis.css('display', 'none');
// For debugging only: alert('There is NO more like this, or just ONE!');
}
else {
// For debugging only: alert('There are at least TWO more like this!');
}
};

// Execute the function as soon as the HTML document has loaded,
// and the DOM can be manipulated without possible side effects
$(document).ready (RemoveEmptyText);

/* End of file RemoveEmptyText */