Add fastpaths for when no objects are found

If there are no objects found, there is no reason to inspect the
result columns and mallocing a zero-sized  (which will be 1 byte
in reality) heap buffer for it.  Add a fast-path for immediately
returning like how other object inspection functions are already
doing it.

Reviewed-by: Ranier Vilela <[email protected]>
Discussion: https://postgr.es/m/[email protected]

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