The crash is the result of an attempt made by JOIN::optimize to evaluate
the WHERE condition when no records have been actually read.
The fix is to remove erroneous 'outer_join' variable check.


mysql-test/r/join.result:
  test result
mysql-test/t/join.test:
  test case
sql/sql_select.cc:
  removed erroneous 'outer_join' variable check.