[openstreetmap/openstreetmap-website] Friendly error msg for missing iD key in application.yml (#1842)

[mmd]

A blank id key will show an "iD has not been configured"popup when starting iD.
Fixes #1830
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1842

-- Commit Summary --

  * Friendly error msg for missing iD key in application.yml

-- File Changes --

    M app/views/site/_id.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1842.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1842.diff

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