json_query conditional wrapper bug

[Peter Eisentraut]

These are ok:

select json_query('{"a": 1, "b": 42}'::jsonb, 'lax $.b' without wrapper);
 json_query
------------
 42
select json_query('{"a": 1, "b": 42}'::jsonb, 'lax $.b' with 
unconditional wrapper);
 json_query
------------
 [42]

But this appears to be wrong:

select json_query('{"a": 1, "b": 42}'::jsonb, 'lax $.b' with conditional 
wrapper);
 json_query
------------
 [42]

This should return an unwrapped 42.