[Wikidata-bugs] [Maniphest] [Created] T178786: Empty map results give an error

[Yurik]

Yurik created this task. Yurik added a project: Wikidata-Query-Service. Herald added a subscriber: Aklapper. Herald added projects: Wikidata, Discovery.

TASK DESCRIPTION

Both of these queries show unhelpful errors instead of a helpful warning message like "no data was found". Also, looking at the code, there seems to be no way for the visualizer to show a custom error message in the error band above visualizer.

Returns a single empty object

#defaultView:Map
SELECT ?place ?placeLabel ?location
WHERE {}

{
  "head" : {    "vars" : [ "place", "placeLabel", "location" ]  },
  "results" : {    "bindings" : [ { } ]  }
}



Returns empty response

#defaultView:Map
SELECT ?place ?placeLabel ?location
WHERE { wd:Q0 wdt:P0 ?location  . }

{
  "head" : {    "vars" : [ "place", "placeLabel", "location" ]  },
  "results" : {    "bindings" : [ ]  }
}

TASK DETAIL

https://phabricator.wikimedia.org/T178786

EMAIL PREFERENCES

https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Yurik
Cc: Aklapper, Yurik, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, Avner, debt, Gehel, Jonas, FloNight, Xmlizer, jkroll, Smalyshev, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331

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