title: can Velocity set a default value for a variable when no value found in VelocityContext?
body: <p>Velocity just print the tag name if no value was found in VelocityContext, ie, $name in my template file, but there is no value for "name" in VelocityContext, so just "$name" was printed. I want Velocity to print a default value if there is no value for the variable, I just tried to extends AbstractCotnext and override internalGet() method, but the return value of internalGet() will be cast to Node object, I don't know how to create a new Node object in my internalGet() method, and also I think this way is very complex.</p>
  
  <p>is there a simple way to set a default value (default value is just a string) ?</p>
  
  <p>thanks.</p>