Hi,
In my previous post, I mentioned that there are very few empty-map issues remaining in the JSON dumps as well. I think there are only two right now:
https://www.wikidata.org/wiki/Special:EntityData/Q2382164.json https://www.wikidata.org/wiki/Special:EntityData/Q4383128.json
Both have the empty reference problem (a statement has a reference which contains no data whatsoever; look for: "snaks":[]). Maybe somebody wants to look into this (this should not really happen, even if the JSON were serialized correctly).
Cheers,
Markus