Support reading wkw datasets with new mag key instead of wkwResolutions (#1349)

* Support reading wkw datasets with new mag key instead of wkwResolutions

* changelog

Author: fm3

webknossos/Changelog.md

@@ -15,6 +15,7 @@ For upgrade instructions, please check the respective _Breaking Changes_ section
 ### Breaking Changes
 
 ### Added
+- Added support for reading wkw datasets with the new "mag" key in datasource-properties.json, which replaces "wkwResolutions" for datasets written out by the webknossos server. [#1349](https://github.com/scalableminds/webknossos-libs/pull/1349)
 
 ### Changed
 

webknossos/webknossos/dataset/properties.py

@@ -368,10 +368,11 @@ def __layer_properties_pre_structure(
         type_value: type[LayerProperties | SegmentationLayerProperties],
     ) -> LayerProperties | SegmentationLayerProperties:
         if d["dataFormat"] == "wkw":
-            d["mags"] = [
-                mag_view_properties_pre_structure(m) for m in d["wkwResolutions"]
-            ]
-            del d["wkwResolutions"]
+            if "wkwResolutions" in d:
+                d["mags"] = [
+                    mag_view_properties_pre_structure(m) for m in d["wkwResolutions"]
+                ]
+                del d["wkwResolutions"]
         # bounding_box and additional_axes are internally handled as nd_bounding_box
         if "additionalAxes" in d:
             d["boundingBox"]["additionalAxes"] = copy.deepcopy(d["additionalAxes"])