FEATURE: Added Store Text For Missing Product List Pages

Added store text that shows when/if a product list page is reached that is outside the total pages (possibly from a bookmark or search result or mischievous customer).

The store text values are:

ProductList_NoProductsFound_Category,
ProductList_NoProductsFound_Manufacturer,
ProductList_NoProductsFound_Attribute,
ProductList_NoProductsFound_Search (only shows if 0 results of all searches, products, categories, content pages, mfgs, etc)

These merge codes are needed to render it:

$$NOPRODUCTSFOUND$$ for Category, Manufacturer, and Attribute
$$NORESULTS$$ for Search page.

This is the CSS used to style it like below:

.ProductListNoProductsFound {
display: block;
border: 1px solid #fcefa1;
border-radius: 4px;
background: url(/store/i/help.png) no-repeat 10px 50% #fbf9ee;
color: #363636;
padding: 10px 10px 10px 35px;
margin: 10px 0;
}