Ignore missing schemas during non-interactive assignment of search_path.

This aligns 9.1's behavior with that of older branches.  HEAD is now even
laxer, ignoring missing schemas all the time, but that seems like too big
a change for a released branch.  Per complaint from Robert Haas.

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/35400e14b8e0dea994862d0f16d275b35b5e31b3

Modified Files
--------------
src/backend/catalog/namespace.c |    4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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