Fix bug with "combined rows" like Theory / Basis set

[ghutchis]

Fixes #1124 and fixes #1052

Signed-off-by: Geoff Hutchison geoff.hutchison@gmail.com

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[github-actions]

Here are the build results
Avogadro2.AppImage
macOS.dmg
Ubuntu-2004.tar.gz
Win64.exe
Artifacts will only be retained for 90 days.

[e-kwsm]

Thanks, it works.