Fix director typemaps for pointers so that NULL pointers are correctly marshalled to C#/Java null in director methods

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10662 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/director_basic.i

@@ -112,12 +112,14 @@ public:
     return vmethod(b);
   }  
 
-
   static MyClass *get_self(MyClass *c) 
   {
     return c;
   }
-  
+
+  static Bar * call_pmethod(MyClass *myclass, Bar *b) {
+    return myclass->pmethod(b);
+  }
 };
 
 template<class T>