Set required parameter $1 in wikibase-error-unexpected

See wikibase.RepoApi.js, function _logFailure() for how the
fail() parameters are structured. It's not jQuery!

Change-Id: I6cd5c7f2a5c1aabf3913d5d3b2fb401b6f6c32b7
Merge "Set required parameter $1 in wikibase-error-unexpected"