Fixed condition to no longer raise an error

Karsten Prehn requested to merge fix/function-classification_from_features into main

The function that tries to deduce the classification of pure water or land tiles from imported geometries would throw an error (by definition) when the geometry consists of multiple parts that all resolve to the same quadkey.

This MR changes the ValueError to a warning and adds a check to not add the same quadkey twice.

\approve @ds @laurens

Edited by Karsten Prehn

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