Cleanup: Reformat with black

No functional changes.

blender_asset_tracer/pack/__init__.py

@@ -102,7 +102,7 @@ class Packer:
         *,
         noop=False,
         compress=False,
-        relative_only=False
+        relative_only=False,
     ) -> None:
         self.blendfile = bfile
         self.project = project
@@ -475,8 +475,9 @@ class Packer:
             # It is *not* used for any disk I/O, since the file may not even
             # exist on the local filesystem.
             bfile_pp = action.new_path
-            assert bfile_pp is not None, \
-                f"Action {action.path_action.name} on {bfile_path} has no final path set, unable to process"
+            assert (
+                bfile_pp is not None
+            ), f"Action {action.path_action.name} on {bfile_path} has no final path set, unable to process"
 
             # Use tempfile to create a unique name in our temporary directoy.
             # The file should be deleted when self.close() is called, and not