I need a litle help when the Product Description is Null or Blank (no value), i need into the HTML View to return a text "No Product Description".
Probably the best thing to do, so you don't need to make any changes to your theme and it will apply wherever description is displayed, is to add a new filter - Search and Replace RegExp which can be found in this comment. With that in place, add a new Global Filter to the Description field, and in the Search box on the configuration page for the filter enter:
...and in the Replace box, the alternative text you want to use:
No Product Description
In a regular expression, ^ is the beginning of line anchor, and $ is the end of line anchor so ^$ will only match an empty value.
If you would prefer to hard code the changes into your product page HTML module, simply edit html/product.php and look for the following code:
$mainProduct = $product["products"];
...and REPLACE with:
$mainProduct = $product["products"];if (!$mainProduct["description"]) $mainProduct["description"] = "No Product Description";