Fix handling of NULL return value in typarray lookup

Commit 6ebeeae29 accidentally omitted testing the return value from
findTypeByOid which can return NULL.  Fix by adding a check to make
sure that we have a pointer to dereference.

Author: Ranier Vilela <ranier...@gmail.com>
Reviewed-by: Nathan Bossart <nathandboss...@gmail.com>
Reviewed-by: Daniel Gustafsson <dan...@yesql.se>
Discussion: 
https://postgr.es/m/CAEudQAqfMTH8Ya_J6E-NW_y_JyDFDxtQ4V_g6nY_1=0odbq...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/85837b8037ada19d319fa4d3ba99c72205868199

Modified Files
--------------
src/bin/pg_dump/pg_dump.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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