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().