thd->lex->derived_tables should be zero(it may be changed if we open a view)


mysql-test/r/check.result:
  Fix for bug#9897: Views: 'Check Table' crashes MySQL, with a view and a table in the statement
mysql-test/t/check.test:
  Fix for bug#9897: Views: 'Check Table' crashes MySQL, with a view and a table in the statement
sql/sql_table.cc:
  Fix for bug#9897: Views: 'Check Table' crashes MySQL, with a view and a table in the statement