KeyError when query includes "UNION" about aiosparql HOT 2 OPEN

Querying the endpoint two times and then combining the results afterwards was no problem. But it basically halves the amount of queries I can do per second because now I need two queries instead of one to resolve one task.

Nevertheless, I found a way to combine the queries in one without causing the KeyError Bug for anyone having the same problem

SELECT * WHERE {
       { select ?redirects where 
                {dbr:Big_Trout_Lake dbo:wikiPageRedirects ?redirects}
        }
UNION
        { select ?redirects where 
              { ?redirects dbo:wikiPageRedirects dbr:Big_Trout_Lake}
        }
}

from aiosparql.

@BAAngelos if you create a pull request I'm happy to review, merge and publish a new release.

from aiosparql.