sage

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gh-37147: fix doctest in gap_packages (using empty table) This is fixing a misbehaviour of empty tables, in their new unicode clothes. ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. - [x] I have created tests covering the changes. URL: https://github.com/sagemath/sage/pull/37147 Reported by: Frédéric Chapoton Reviewer(s): Travis Scrimshaw