Removing unnecessary debug information. Adding missing virtual
destructors to base classes
diff --git a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
index 975c0c6..ad0ff74 100644
--- a/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
+++ b/helper/ccnb-parser/visitors/ccnb-parser-void-no-argu-visitor.h
@@ -43,6 +43,8 @@
   virtual void visit (Dtag& )=0; ///< \brief Method accepting DTAG block
   virtual void visit (Dattr&)=0; ///< \brief Method accepting DATTR block
   virtual void visit (Ext&  )=0; ///< \brief Method accepting EXT block
+
+  virtual ~VoidNoArguVisitor () { }
 };
   
 }