pythonPackages.pyramid_exclog: add import check

pkgs/development/python-modules/pyramid_exclog/default.nix

···
 
   propagatedBuildInputs = [ pyramid ];
 
+  pythonImportsCheck = [ "pyramid_exclog" ];
+
   meta = with lib; {
     description = "A package which logs to a Python logger when an exception is raised by a Pyramid application";
     homepage = "https://docs.pylonsproject.org/";