Invalid image if "featured object" has no thumbnail

[esnible]

If the Featured Object has no thumbnail, an invalid image is generated:

<a href="http://localhost:9080/orbeon/numishare/collection1/id/805cceadd3">
<img src="/orbeon/numishare/collection1/">
</a>

The link works fine.

For this particular image coin, all I had was a combined reference, so perhaps it is not the thumbnail but something else being looked for.