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

[Holger Jeromin]

I quite changed
`route: to.lat + "," + to.lng + ";" + from.lat + "," + from.lng`
to 
`route: to ? (to.lat + "," + to.lng) : "" + ";" + from ? (from.lat + "," + from.lng) : ""`

But this looks ugly

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