Avoided (infinite) display of "The list is loading. Just a moment please."... #214
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... for queries that should show "The result list is empty.", in cases where the user does not have the right to read the involved source(s).
Fixes #209.
In some cases (not our test case, but the query mentioned in the issue is a not easy to replicate example), the stream returned by Comunica is already "done" before we can attach our listeners. So, checking its done status is the solution.