Missing icon in the document Tree for all documents of type text/plain

Since updating to MODx 1.0.1, all documents in the document tree that are of type text/plain do not display an image but a missing image link.
It is very easy to reproduce in my case. Edit any document, change the type to text/plain in option, the icon goes away. Change it back to anything else, the icon is back.

not sure, might be related -> http://modxcms.com/forums/index.php/topic,41461.0.html

Edit any document, change the type to text/plain in option, the icon goes away.

Confirmed, please create a bug ticket in JIRA.

Fixed in svn http://svn.modxcms.com/crucible/changelog/modx/branches/1.0?cs=5971
But not in 1.0.x branch.

No problems after patch?

The patch posted by Paprikas fixed the problem for me. No side effect as far as I can see.

Thanks for the fast replies.

I can confirm this is in the 1.0.2 release trunk.