[openstreetmap/openstreetmap-website] Prevent exceptions while reversing directions (#2521)

[Tom Hughes]

As far as I can tell the difference is that the old code takes the geocoded results from the input fields and the new code takes the position of the actual map markers but I'm not sure why one would ever exist without the other and, if they're not tied together properly, how we know which is more reliable.

Really I want to understand what is happening and how we get to this state before we can determine if this is the best approach.

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