Bug 33362: Allow return claims to be resolved even if the issue has since been delete...

Bug 33362: Allow return claims to be resolved even if the issue has since been delete from the database

Test Plan:
1) Check out an item
2) Claim return on it, moving it to the old_issues table
3) Delete the old_issue via koha-mysql or Use cleanup_database.pl
4) Attempt to resolve the claim
5) Note the error
6) Apply this patch set
7) Restart all the things!
8) Attempt to resolve the claim
9) No errors!

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 816bbbe77f47688ee79f6664e60cc72ce5d7dd4a)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>