If the WHERE condition of a query contained an ORed FALSE term
then the set of tables whose rows cannot serve for null complements
in outer joins was determined incorrectly. It resulted in blocking 
possible conversions of outer joins into joins for such queries.


mysql-test/r/join_outer.result:
  Added a test case for bug #17164.
mysql-test/t/join_outer.test:
  Added a test case for bug #17164.