Throws
   The returned PEAR_Error object in case of an error
   is unspecific, so you can ignore the error code and/or message.
   The reason for a failure could be a failed connection to the server
   or the server did not run a finger service.
  
Note: 
    You will not get a PEAR_Error, 
    if the query fails due to a not existing finger object. 
    This can be only done by checking the data returned by 
    query().