Bug 13787 - Clean up noisy opac-advsearch warnings

Bug 13787 - Clean up noisy opac-advsearch warnings

While testing bug 10937, there were noisy warnings, which
distracted from testing the functionality of it.

Here is a snippet of the after the patch warnings:
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 384.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 161.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 161.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 177.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 177.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 202.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 202.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 240.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 240.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 256.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 256.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 356.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 356.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 369.
Argument "" isn't numeric in numeric gt (>) at /home/mtompset/kohaclone/koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-advsearch.tt line 369.

Tweaking the [% IF %] statements eliminated the warnings.

TEST PLAN
---------
1) Apply patch
2) Run koha qa test tools.
   -- there will be noisy warnings in the before processing, but
      there will be no such messages in the after processing.
3) git diff origin/master
   -- there should be no visible typos.

Signed-off-by: Magnus Enger <magnus@enger.priv.no>
- Applied the patch from bug 10937
- Ran "koha-qa.pl -c 1" and observed the warnings described in the
  commit message
- Applied the patch from this bug
- Ran "koha-qa.pl -c 1" again and saw no warnings
- Ran "koha-qa.pl -c 2" and saw no warnings

I have not tested the functionality of 10937 with this patch, just verified
that the changes look sensible.

This patch feels more like a followup for 10937, than a separate patch,
especially since 10937 is just "signed off" at this time. But as long as it
works...

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>