Ensure that mysqldump doesn't give an error about missing Index.xml when it's not needed


client/mysqldump.c:
  Added better default --debug option
mysql-test/r/show_check.result:
  Fixed result after Type->Engine conversion
mysys/charset.c:
  Don't give error if Index.xml doesn't exists
  (If we can't find the character set, the later error will include the used patch to the Index.xml file)