libpq: change PQconndefaults() to ignore invalid service files

Bruce Momjian <bruce@momjian.us>

Commit: 9e0a97f1c8316e36fa4a8626e0a60792b0fb0c2e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-12-03T16:12:25Z
Releases: 9.4.0
libpq:  change PQconndefaults() to ignore invalid service files

Previously missing or invalid service files returned NULL.  Also fix
pg_upgrade to report "out of memory" for a null return from
PQconndefaults().

Patch by Steve Singer, rewritten by me

Files