`undefined/undefined` listed in the "Check the pages that have been modified" PR comment

[tbouffard]

I have recently seen this in https://github.com/bonitasoft/bonita-doc/pull/2715#issuecomment-2147819787 In this PR, the updated files are

• a regular page
• a navigation file

It seems that the bug #534 is not fully fixed by #674.