[BUGS] BUG #14487: malformed empty array from array_fill

The following bug has been logged on the website:

Bug reference:      14487
Logged by:          Andrew Gierth
Email address:      andrew@tao11.riddles.org.uk
PostgreSQL version: 9.6.1
Operating system:   any
Description:

array_fill returns a malformed empty array when given a size of zero:

select a, a = '{}' from (select array_fill(null::integer, array[0]) as a)
s;
 a  | ?column? 
----+----------
 {} | f

The result actually has ndims=1 and a length of 0, which can be checked with
array_length(a,1).

Obvious fix is to move the fast-track empty result to after computing
nitems?


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