Revert "change the execute in ExecutorClosure"

This reverts commit 47aaa8c853c4af91808dadd6790647d1b4c606b4.
diff --git a/ccnx/ccnx-closure.cpp b/ccnx/ccnx-closure.cpp
index 57b520a..5abcb3e 100644
--- a/ccnx/ccnx-closure.cpp
+++ b/ccnx/ccnx-closure.cpp
@@ -73,10 +73,7 @@
 void
 ExecutorClosure::execute(Name name, PcoPtr content)
 {
-  if (!m_dataCallback.empty ())
-    {
-      m_dataCallback (name, content);
-    }
+  Closure::runDataCallback(name, content);
 }
 
 ExecutorInterestClosure::ExecutorInterestClosure(const InterestCallback &callback, ExecutorPtr executor)