https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20638

--- Comment #33 from Tomás Cohen Arazi (tcohen) <[email protected]> ---
Created attachment 187011
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=187011&action=edit
Bug 20638: (follow-up) Silence viewlog.pl warning

This patch fixes useless warnings being printed by `viewlog.pl` I
noticed while testing this new feature.

To test:
1. Test the feature introduced by this patchset
2. Make sure you are running:
   $ ktd --shell
  k$ tail -f /var/log/koha/kohadev/*.log
=> FAIL: You see things like:

```
[2025/09/26 18:37:39] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:37:39] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:37:39] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:37:39] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:37:39] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:43:44] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
[2025/09/26 18:43:44] [WARN] Use of uninitialized value in substr at
/kohadevbox/koha/tools/viewlog.pl line 156.
```
3. Refresh the viewlog page
=> FAIL: They are consistent
4. Apply this patch
5. Repeat 3
=> SUCCESS: No more warnings!
6. Sign off :-D

Signed-off-by: Tomás Cohen Arazi <[email protected]>

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