Guard against uninitialized default locale.

No known problem today, but defend against issues like dbf217c1c7 in
the future.

Discussion: 
https://postgr.es/m/[email protected]
Reviewed-by: Ayush Tiwari <[email protected]>
Backpatch-through: 17

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/26bd362655bc16e2f86eedb87a7d7c37a1d553d3

Modified Files
--------------
src/backend/utils/adt/pg_locale.c | 6 ++++++
1 file changed, 6 insertions(+)

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