Bug 11513: fix log warning noise in patron category editor

Bug 11513: fix log warning noise in patron category editor

Just going to the patron categories page triggered errors.
Running through all the plain options also triggered other
warnings. This fix silences them.

Discovered tabs I had not corrected by running qa test tool.

Some errors which I could not trigger were also fixed, such
as line 248 shown by Merllissia Manueli.

TEST PLAN
---------
 1) Log in to staff client
 2) Click 'Administration'
 3) Click 'Patron categories'
 4) Click '+ New category'
 5) Enter a dummy category and click 'Save'
 6) Click 'Edit' for the dummy category.
 7) Change a value and click 'Save'
 8) Click 'Delete' for the dummy category.
 9) Confirm to delete.
10) Review error log, several new warnings
11) Apply patch
12) Run the koha qa test tool.
13) Click 'Home'
14) Click 'Administration'
15) Click 'Patron categories'
16) Click '+ New category'
17) Enter a dummy category and click 'Save'
18) Click 'Edit' for the dummy category.
19) Change a value and click 'Save'
20) Click 'Delete' for the dummy category.
21) Confirm to delete.
22) Review error log, no new warnings

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Followed test plan, saw no errors in the log after applying the patch.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Tested various dates and enrollment periods with different settings of
dateformat pref. Works as advertised. No warnings.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>