<fix>: remove ASTReference impl in CompiledVisitor

Author: xiaoma20082008

velocity-engine-core/src/main/java/org/apache/velocity/spi/translators/templates/CompiledVisitor.java

@@ -153,26 +153,7 @@ public String visit(ASTReference node, Object data) {
     // 1. Variables
     // 2. Properties
     // 3. Methods
-    String s;
-    if (node.getFirstToken().equals(node.getLastToken())) {
-      s = node.getFirstToken().image.substring(1);
-    } else {
-      s = node.getFirstToken().image;
-      for (Token t = node.getFirstToken().next; t != node.getLastToken(); t = t.next) {
-        if (StringUtils.isNotBlank(t.image)) {
-          s = t.image;
-          break;
-        }
-      }
-    }
-    if (node.jjtGetParent() instanceof ASTprocess) {
-      // 最外层直接输出
-      s = "    $output.write($context.get(\"" + s + "\"));\r\n";
-    } else {
-      // 其它命令包含的
-      s = "$context.get(\"" + s + "\")";
-    }
-    return s;
+    return null;
   }
 
   @Override