Cope with syntax error in Wikidata timout error data

[timbl]

See Wikimedia Bug: Timeout in Wikidata Query Service #WQDS breaks the JSON response syntax by injecting a raw text Error message with a Java stack dump

Copying with that would involve parsing the data which is before the error message interrupts it.

It would involve noting that we don't have all the data, in the same way as when we hit the LIMIT parameter.

[timbl]

There is an attempt to address this currenly in fixWikidataJSON in publicData