remove redundant void

src/App/ExtensionContainerPyImp.cpp

@@ -36,7 +36,7 @@
 using namespace App;
 
 // returns a string which represent the object e.g. when printed in python
-std::string ExtensionContainerPy::representation(void) const
+std::string ExtensionContainerPy::representation() const
 {
     return std::string("<extension>");
 }