Method _warn_empty

src/ghstack/submit.py:1062–1068

(
        self, diff: ghstack.diff.Diff, elab_diff: Optional[DiffWithGitHubMetadata]
    )

        )

    def _warn_empty(
        self, diff: ghstack.diff.Diff, elab_diff: Optional[DiffWithGitHubMetadata]
    ) -> None:
        self.ignored_diffs.append((diff, elab_diff))
        logging.warning(
            "Skipping '{}', as the commit now has no changes".format(diff.title)
        )

    def _allocate_ghnum(self) -> GhNumber:
        # Determine the next available GhNumber.  We do this by