When using `bpy.data.actions[action_name, "nonexistant-library"]`, use the term `filepath` instead of `name` in the error message. Also increase the size to match the file path length. Ref D10253
When using `bpy.data.actions[action_name, "nonexistant-library"]`, use the term `filepath` instead of `name` in the error message. Also increase the size to match the file path length. Ref D10253