[openstreetmap/openstreetmap-website] Fixes "new trace" validation error (#1938)

[Jamie Guthrie]

@jguthrie100 pushed 1 commit.

0748099  Refactored and added new test


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1938/files/a04b19a9aede097d2d7ea0d5cb10cef69312bbd3..07480996d752805db307944749d5174ef657dac5
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