Hi!
My recent tests produced lists of empty or almost empty items, meaning that they have no sitelinks, no statements, no label (almost empty), and sometimes no descriptions or aliases either (empty). Many of the empty ones seem to be redirects now, but not all (e.g. Q18482644).
Maybe somebody would like to check what is going on in each case. It seems like in most cases, a merge has emptied the item and a redirect should be placed now.
Some of them are redirects. Some of them are very strange items: with description of "Wikimedia category" and no labels or links. I suspect it is leftover from some bug. Check out here: http://tinyurl.com/ot47amh
I'll try to see if there are other patterns there.