added missing subdirectory command for the python subfolder in the

CMakeLists.txt file

CMakeLists.txt

@@ -44,6 +44,7 @@ add_subdirectory(utils)
 
 if(NOT (${DUNE_COMMON_VERSION} VERSION_LESS 2.6))
   if(DUNE_PYTHON_pip_FOUND)
+    add_subdirectory("python")
     dune_python_install_package(PATH "python")
   endif()
 endif()