Fix `as_result_df` bug for small tables #996

All 197 tests pass in 1m 29s

      1 files     24 suites 1m 29s ⏱️
  197 tests   197 ✔️ 0 💤 0 ❌
1 506 runs 1 506 ✔️ 0 💤 0 ❌

Results for commit 5ef4e51.