Bug 23218: Fix shift in patron's attributes in batch patron modification

Bug 23218: Fix shift in patron's attributes in batch patron modification

When the "new" button is clicked without selecting a patron's attribute, the update will have unexpected behaviors.

There is indeed a difference in the number of patron's attributes and the number of values.

Test plan:
Go to the batch patron modification
Enter a cardnumber
At the bottom of the page, click "new" without selecting an attribute
On the second line select one, and a value (different than an empty
string)
Save
=> The attribute will be updated with an empty string

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit ea0127b7fa53335f3e9d3f0170fbc92b2ffd9e3c)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>