Bug 13114: Prevent Shibboleth Patches from spamming logs

- The shibboleth patch introduced an undefined message into the error
  logs, when shiboleth is disabled.

Testplan

1. Ensure shibboleth is disabled.
2. Refresh any opac page
3. See 'Use of uninitialized value $ENV{"REMOTE_USER"} in string ne at
/home/koha/kohaclone/C4/Auth.pm line 711.' popup in the opac-error.log
4. Apply patch
5. Refresh opac page
6. Error should no longer appear

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Bug 13115 - Holidays.t will fail some unit tests on Sundays

Due to the fact that Sunday is a repeating holiday in the example data
which is used for part but not all of Holidays.t, the last test will
fail on Sundays. The test is to see if today is *not* a special holiday
for MPL, but since it's already a repeating holiday, is_holiday will
return true rather than false.

Test Plan:
1) Wait until Sunday
2) prove t/db_dependent/Holidays.t
3) Note the failure
4) Apply this patch
5) Repeat step 2
6) Note there is no longer a failure

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Used my time machine... :)

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>