Fix rendering of MFHD records when ownership is out of scope

Fix rendering of MFHD records when ownership is out of scope

Dojo would die with a null reference error when an MFHD record
was retrieved that was outside of the current OU search scope.
For example, if a given bib record had one linked MFHD record
for BR1, and one linked MFHD record for BR4, the details page
would choke trying to draw the MFHD holdings in a scope that
only included BR1 and end up drawing nothing. Ungood.

Moving the ownership check and invoking _holdingsDrawMFHD()
only after ensuring that the record is within our scope resolves
the problem.

Signed-off-by: Dan Scott <dscott@laurentian.ca>