set_multi fails when single array reference passed.

[rrb3942]

If you call set_multi with just a single array reference as the value it fails with the following errors:

'Using second stack item for AV '
'Expected array reference'

Example of how to reproduce:
my $ con = $con = Couchbase::Client->new({ server => '127.0.0.1', bucket => 'default' });
my $opret = $con->set_multi([ 'somekey', 'somevalue' ])

This may seem odd, but in my use case I am calling set_multi to bulk insert, I then check all of the returns and append any failed to a list to try again, and call set_multi with that list. Rinse, repeat in a loop until all items have been inserted successfully.

Since set_multi can't handle a single item list I was occasionally getting a crash when only a single item remained to be retried.

I am now checking to see if only a single insert remains, but it would be more convenient if set_multi worked with a single item list.

[mnunberg]

Fixed in 1.0.1