[antlr-interest] why "null" does not work (String Template)

[gaochunguang]

  StringTemplate st = new 
       StringTemplate("<chars; wrap, null=\"0\">",     
       AngleBracketTemplateLexer.class);
  st.setAttribute("chars", "a");
  st.setAttribute("chars", "b");
  st.setAttribute("chars", "c");
  st.setAttribute("chars", null);
  st.setAttribute("chars", "e");
  st.setAttribute("chars", "f");
  System.out.println(st.toString());

output is abcef.

thanks!
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