Fix for CMake failure from empty Homebrew Python site-packages
Fix for CMake failure from empty Homebrew Python site-packages

    CMake Error at src/MacAppBundle/CMakeLists.txt:25 (string):
      string sub-command STRIP requires two arguments.

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master