[COMMITTERS] pgsql: Fix uninitialized-variable bug.

Fix uninitialized-variable bug.

map_partition_varattnos() failed to set its found_whole_row output
parameter if the given expression list was NIL.  This seems to be
a pre-existing bug that chanced to be exposed by commit 6f6b99d13.
It might be unreachable in v10, but I have little faith in that
proposition, so back-patch.

Per buildfarm.

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/1377b40965b257e228ae8faf45c6ce145ce357e5

Modified Files
--------------
src/backend/catalog/partition.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)


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