Currently either attribute "file" or attribute "item" is mandatory for <tml:image>.
We changed this and render the primary file of the current content or the first attachment of the content if no file is specified (via file or item).
<tml:image/>
This renders the primary file (or first file) if present or nothing if not.
In addition we fixed an issue when <tml:image wrap="..."> is used with (deprecated) body content (for <img> element attributes) together with tml wrap attribute.