Don't emit garbage "\[un]restrict (null)" commands in pg_dump.

_reconnectToDB() failed to consider the possibility that it could
be called without any restrict_key set.  This is reachable while
generating the "restore.sql" file in tar dump mode, which nobody
noticed because that file is mostly unused (and nothing really
bad happens anyway unless you specified --inserts mode).  But
I wonder if there are other code paths that reach the issue.

Bug: #19718
Reported-by: Pavel Kopylov <[email protected]>
Author: Pavel Kopylov <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2d748cfe337ec5afab3863f733caca43333c89cf

Modified Files
--------------
src/bin/pg_dump/pg_backup_archiver.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

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