[3.12] gh-109375: Fix bug where pdb registers an alias without an associated command (GH-109376) (#109429)

gh-109375: Fix bug where pdb registers an alias without an associated command (GH-109376)
(cherry picked from commit 68a6f21f47e779ddd70e33cf04d170a63f077fcd)

Co-authored-by: buermarc <44375277+buermarc@users.noreply.github.com>