OG:Image Property on Category Pages

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   I am using ProductCart v4.1bacm SP 1 and have just discovered a bug with the way that the include-metatags.php file creates the Open Graph meta tags.
It works just fine on product pages (BTO or otherwise), but it doesn't work on the homepage or category pages because it uses a reference of <%=ogImage%> which is only defined for Product page section of the include-metatags.php file, thus creating a reference to a broken image, so that when people go to share this content on Facebook, it shows up with a broken link (or none at all).

How do we define the following variable in such a way as to have it also see the small images for category pages, and then if no image, default to some image?

ogImage=rsTagObj("smallimageurl")
<meta property="og:image" content="http://www.bestfriendservices.com/store/pc/catalog/<%=ogImage%>"/>

This has become a prominent issue for me as I just implemented a new feature which uses these values to "recommend" other pages to the visitor, and half of my "recommendations" are to pages with a broken image. See http://www.bestfriendservices.com/ and then browse a few pages to see what I am talking about.