[openstreetmap-website] Can't click on zoom bar (#343)

[Ian Dees]

@harry-wood reported this on IRC and I just confirmed it. Getting the following error:

```
Uncaught TypeError: Cannot call method 'getBoundingClientRect' of undefined application-a6d7d6936b94d13540851a8cf8de17e2.js:37
i.DomEvent.getMousePosition application-a6d7d6936b94d13540851a8cf8de17e2.js:37
L.Control.extend._onSliderClick application-a6d7d6936b94d13540851a8cf8de17e2.js:48
e.(anonymous function).o
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/343
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