question on Velocity: How to let Velocity keep silent when some exceptions occur?

[bluejoe]

  Hi, I am a user of Velocity, now I have a question: How to let Velocity keep 
silent when some exceptions occur?
       
  For example, I wrote codes:
       
    my name is: $o.foo()
       
  In some cases, foo() may throw some exceptions, like NullException, etc. It 
seems that Velocity will throw these exceptions too. But I want Velocity to 
regard the statement as:
       
    my name is: <empty>
       
  Is there any way to let Velocity ignore the errors? 
       
Sincerely Yours,
bluejoe
2008-9-11