[openstreetmap-website] Fix application error on non-feature search results (#598)

[John Firebaugh]

Fixes #560
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website 560

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/598

-- Commit Summary --

  * Fix application error on non-feature search results

-- File Changes --

    M app/assets/javascripts/index/search.js (9)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/598.patch
https://github.com/openstreetmap/openstreetmap-website/pull/598.diff
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