Removed unnecessary error message from mysql.cc (client program)


client/mysql.cc:
  BUG #12119
  
  The error message "Didn't find any fields in table ..." would 
  be printed out when a table was created and dropped in rapid succession 
  via a perl script. The client would get a list of tables, meanwhile, the 
  one table would be deleted, and then this error message printed when the 
  table was not found, which it should just quietly not print the fields.
  Removing the error message fixes this issue.