According to the API documentation, wbgetentities should accept requests with:
• one site for several titles, or
• several sites for one title.

However, patch 80797 changed the code to only allow:
• one site and several titles, or
• equal numbers of sites and titles.

(see here: https://gerrit.wikimedia.org/r/#/c/80797/)

So this request works fine:
https://www.wikidata.org/w/api.php?action=wbgetentities&sites=enwiki|itwiki&titles=London|Berlin

But this one returns an error:
https://www.wikidata.org/w/api.php?action=wbgetentities&sites=enwiki|itwiki&titles=London

It doesn't make sense, the older behavior should be restored.

Version: master
Severity: normal