remove redundant void

src/App/DocumentObjectExtensionPyImp.cpp

@@ -30,7 +30,7 @@
 using namespace App;
 
 // returns a string which represent the object e.g. when printed in python
-std::string DocumentObjectExtensionPy::representation(void) const
+std::string DocumentObjectExtensionPy::representation() const
 {
     return std::string("<document object extension>");
 }