pgsql: intarray: return empty zero-dimensional array for an empty arra

intarray: return empty zero-dimensional array for an empty array

Previously a one-dimensional empty array was returned, but its text
representation matched a zero-dimensional array, and there is no way to
dump/reload a one-dimensional empty array.

BACKWARD INCOMPATIBILITY

Per report from elein

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/c155f654b4f755b4111bd9adb60559fe22526a10

Modified Files
--------------
contrib/intarray/_int_tool.c | 7 +++++++
1 file changed, 7 insertions(+)

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