osmApi: Display error on save for 409/412 responses #674
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Description
When OSM API returns Response 409 or 412, osmapp stops saving without explanation.
Example links
Try to remove this Relation https://osmapp.org/relation/5250576
OSM returns 412 Precondition failed: The relation 5250576 is used in relation 237270.
Same can be with 409 - conflict, see https://wiki.openstreetmap.org/wiki/API_v0.6#Error_codes_15
Screenshots
Error 404, responseText is empty:
Error 412:
Error 410:
Checklist