message: CMAKE: Improve python detection
diff: @@ -254,10 +254,12 @@ find_python(3.4 "${MIN_VER_PYTHON3}" PYTHON3_LIBRARY PYTHON3_INCLUDE_DIR
  if(PYTHON_DEFAULT_EXECUTABLE)
  set(PYTHON_DEFAULT_AVAILABLE "TRUE")
  -elseif(PYTHON2INTERP_FOUND) # Use Python 2 as default Python interpreter
  +elseif(PYTHON2_EXECUTABLE AND PYTHON2INTERP_FOUND)
  + # Use Python 2 as default Python interpreter
  set(PYTHON_DEFAULT_AVAILABLE "TRUE")
  set(PYTHON_DEFAULT_EXECUTABLE "${PYTHON2_EXECUTABLE}")
  -elseif(PYTHON3INTERP_FOUND) # Use Python 3 as fallback Python interpreter (if there is no Python 2)
  +elseif(PYTHON3_EXECUTABLE AND PYTHON3INTERP_FOUND)
  + # Use Python 3 as fallback Python interpreter (if there is no Python 2)
  set(PYTHON_DEFAULT_AVAILABLE "TRUE")
  set(PYTHON_DEFAULT_EXECUTABLE "${PYTHON3_EXECUTABLE}")
  endif()
  