Bug 5529 Absence or Presence of lists not being reliably returned

Bug 5529 Absence or Presence of lists not being reliably returned

C4::VirtualShelves::GetRecentShelves contained some rather confused
code The contents of the requested list are returned in an arrayref
which was in its turn being wrapped needlessly in an array
As a result the returned array always consisted of a single element
irrespective of the number of lists.
Made the routine return the arrayref, which can now be tested directly
Unfortunately rather than fixing this we had previously coded around it
assuming it to be a "design" decision. Have amended other calls of
the subroutine resulting in some hopefully less obscure code

Fixed logic error in the results template which displayed new list
within a test for the presence of lists

Removed the offset parameter from the sql in the routine as it was hardcoded
to 0 i.e. the default value

Signed-off-by: fdurand <frederic.durand@univ-lyon2.fr>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>