[openstreetmap/openstreetmap-website] Query tool: hovering over relations sometimes unresponsive (#1608)

[mmd]

Further checking in Chrome, it looks like we have to process a several thousand (!) layers for the relations in question. I think it is faily obvious that this is not the best thing to do. Most of these layers seem also pretty empty.

Could it be, that the following JSON fragment returned from Overpass API tricks the application into creating those useless layers?

```JSON
    {
      "type": "way",
      "ref": 7660203,
      "role": "",
      "geometry": [
      ]
    },
```


![grafik](https://user-images.githubusercontent.com/5842757/29006312-98507e4c-7aed-11e7-92ce-ed2c0e5e99fd.png)




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