Fix for a bug #2219, regarding a bad cast to integer from NULL
item_func.h:
  Fix for a bug #2219, regarding a bad cast to integer from NULL
sql_parse.cc:
  A fix for a bug #2207, with mysql server haning on option setting


sql/sql_parse.cc:
  A fix for a bug #2207, with mysql server haning on option setting
sql/item_func.h:
  Fix for a bug #2219, regarding a bad cast to integer from NULL
mysql-test/t/null.test:
   Fix for a bug #2219, regarding a bad cast to integer from NULL
mysql-test/r/null.result:
   Fix for a bug #2219, regarding a bad cast to integer from NULL