in ON condition

The fix of the bug MDEV-25002 for 10.4 turned out to be incomplete. It
caused crashes when executing CREATE VIEW, CREATE TABLE .. SELECT,
INSERT .. SELECT statements if their SELECTs contained references to
non-existing fields.
This patch complements the fix for MDEV-25002 in order to avoid such
crashes.

Approved by Oleksandr Byelkin <sanja@mariadb.com>