[openstreetmap/openstreetmap-website] undefined method `split' when Nomintim isn't reachable (Issue #4137)

[mtmail]

### URL

https://www.openstreetmap.org/search?query=banana

### How to reproduce the issue?

Right now Nominatim doesn't seem to be reachable. The API request is done in Rails so I can't inspect the HTTP code or error message. If that happens the Rails prints an additional Ruby error "undefined method `split' for nil:NilClass" (which might or might not also be in the webserver error log)

### Screenshot(s) or anything else?

![image](https://github.com/openstreetmap/openstreetmap-website/assets/3727288/a542e35e-08aa-4835-852a-001a0a83d715)


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