Bug 37400 - In returns.pl don't search for a patron unless needed

Bug 37400 - In returns.pl don't search for a patron unless needed

In returns.pl we find a patron, then use it in an if statement.

Test Plan:
Cancel a hold with other holds remaining on the record.
No change should be noted.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 82535a488764be5437c47d38953eb0aea81ce4ee)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit d7e754ea3c6c3f12f784de84bff4b3da31e4e791)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>