Обсуждение: pgsql: Add defenses against nulls-in-arrays to contrib/ltree.

Log Message:
-----------
Add defenses against nulls-in-arrays to contrib/ltree.  Possibly it'd
be useful to actually do something with nulls, rather than reject them,
but I'll just close the hole for now.

Modified Files:
--------------
    pgsql/contrib/ltree:
        _ltree_gist.c (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/_ltree_gist.c.diff?r1=1.12&r2=1.13)
        _ltree_op.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/_ltree_op.c.diff?r1=1.8&r2=1.9)
        lquery_op.c (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/lquery_op.c.diff?r1=1.7&r2=1.8)
        ltree_gist.c (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree_gist.c.diff?r1=1.11&r2=1.12)