Minor fix in update_last_modified_date_of_rows_in_assets_dir
FileNotFoundError can happen because of concurrent api calls, and we can ignore it

(found this error while checking some logs today)
Minor fix in update_last_modified_date_of_rows_in_assets_dir: FileNotFoundError can happen because of concurrent api calls, and we can ignore it

(found this error while checking some logs today)