remove_existing_data_files: allow url to be None

tomoscan/esrf/volume/singleframebase.py

@@ -216,7 +216,7 @@ class VolumeSingleFrameBase(VolumeBase):
         }
         return data_path.format(**keywords)
 
-    def remove_existing_data_files(self, url: DataUrl) -> None:
+    def remove_existing_data_files(self, url: DataUrl | None = None) -> None:
         """Clean any existing files (if overwrite and rights) that must be used for saving"""
         if not os.path.exists(url.file_path()):
             return