message: do not launch test_representation when no pot
diff: @@ -504,7 +504,7 @@ if(PYTHONINTERP_FOUND)
  endif()
  # Representations
  - if(SKLEARN_FOUND AND MATPLOTLIB_FOUND AND NOT CGAL_VERSION VERSION_LESS 4.11.0)
  + if(SKLEARN_FOUND AND MATPLOTLIB_FOUND AND OT_FOUND AND NOT CGAL_VERSION VERSION_LESS 4.11.0)
  add_gudhi_py_test(test_representations)
  endif()
  