Bug 18552: [16.11.X] [QA Follow-up] Resolve warnings

Bug 18552: [16.11.X] [QA Follow-up] Resolve warnings

Like:
Problem = a value of AutoResumeSuspendedHolds has been passed to param without key at /usr/share/koha/masterclone/C4/Templates.pm line 137.
Problem = a value of relatives_borrowernumbers has been passed to param without key at /usr/share/koha/masterclone/C4/Templates.pm line 137.

Problem is functions returning undef in list context (in this case
housebound_role).
No need to call Patrons::find a second time.

Note: The call of GetDebarments in the first patch suffered from this too.
It is in a fine place now too. But strictly speaking, should not have been
moved.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>