Hi OL-Devs, I have a setup with a VectorTile layer based on Mapbox Vector Tiles (created with GeoServer / Geowebcache). To save time at transferring the pbf-files to the target environment all empty pbf-files were deleted. This results in HTTP 404s (of course) when OpenLayers tries to load the missing tiles. I expected that this won't bring any problems and that OL is just ignoring them. But unfortunately a JS-exception occurs if in the current map-exent is one of the missing tiles. It seems that the "tileProjection" is undefined for the given "sourceTile", so the operation tileProjection.getUnits() fails, see here [1]. So it seems that the missing tile is not ignored in the code and due to the lack of information the rendering process fails. If I add an emtpy pbf-file, so no HTTP 404 occurs anymore, the exception is gone. Even though no more information is provided (from my humble point of view).
So here are some questions: Can someone confirm this behavior? Is this wanted behavior for some reasons? Or is this even a bug or an edge case? I am using OpenLayers v4.3.4. Thanks in advance for any hint / help / clarification. Cheers Chris [1] https://github.com/openlayers/openlayers/blob/v4.3.4/src/ol/renderer/canvas/vectortilelayer.js#L139
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