PlaceTokenizer with no (trailing) token

Is there a way to implement a place with no token?

ie, have a tokenizer like this:

@Prefix("prefix")

public class MyTokenizer ... {

  ...

  @Override

  public String getToken(P place) {

    return null; 

  }

}

this one generates tokens like this:

#prefix:null

is there a way to get rid of ':null' ?

thanks,

-g.

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