table: PIT iterator dereferences to const shared_ptr<pit::Entry>&

refs #3164

Change-Id: Id857e214a727917009f865c2cfac782077844799
diff --git a/daemon/table/pit.hpp b/daemon/table/pit.hpp
index ab22691..1df3380 100644
--- a/daemon/table/pit.hpp
+++ b/daemon/table/pit.hpp
@@ -112,7 +112,10 @@
    *  \sa begin()
    */
   const_iterator
-  end() const;
+  end() const
+  {
+    return Iterator();
+  }
 
 private:
   /** \brief erases a PIT Entry