message: Fix syntax in lldb lit.cfg
diff: @@ -46,7 +46,7 @@ config.environment['LD_LIBRARY_PATH'] = path
  config.environment['LLVM_SRC_ROOT'] = getattr(config, 'llvm_src_root', '')
  # Propagate PYTHON_EXECUTABLE into the environment
  -config.environment['PYTHON_EXECUTABLE'] = getattr(config, 'python_executable',
  +config.environment['PYTHON_EXECUTABLE'] = getattr(config, 'python_executable', '')
  # Register substitutions
  config.substitutions.append(('%python', config.python_executable))
  