Bug 22280: Add a unit test

Bug 22280: Add a unit test

This patch adds a unit test to t/db_dependent/Illrequests.t, where
a new node without any next_actions or prev_actions is added to the
core status graph.

Running the tests show a lot of warnings about "no query in
themelanguage", but that should not be related to the current bug.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 291bb7bacfdf68e6bc8e99d5c1e258fbcbf2344b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>