Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  a4bcfb8dc2162c3c188209bc9036a6a5bae08000

more testcases for ByPropertyListSerializer

Having the testcases like this is clearer!
We can also see exactly what is happening

Change-Id: I8b4abbb3ac65520ab4b78432adbc06a73e087e05