[openstreetmap/openstreetmap-website] Return the centre of the image if the bbox has no extent (#3016)

[Andy Allan]

Fixes #3007. 

If all the provided points in the gpx file have the same lat/lon, then an image where they are all at the centre seems plausible.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3016

-- Commit Summary --

  * Return the centre of the image if the bbox has no extent

-- File Changes --

    M lib/osm.rb (5)
    A test/lib/osm_test.rb (15)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3016.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3016.diff

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