Merge pull request #1115 from DLR-RM/iss_1114_scene_cleanup

fix(cleanup): Fixes scene custom prop removal

Author: cornerfarmer

blenderproc/python/utility/Initializer.py

@@ -163,4 +163,6 @@ def remove_all_data(remove_camera: bool = True):
     def remove_custom_properties():
         """ Remove all custom properties registered at global entities like the scene. """
         for key in list(bpy.context.scene.keys()):
-            del bpy.context.scene[key]
+            # Do not remove blender's internal property "cycles"
+            if key not in ["cycles"]:
+                del bpy.context.scene[key]