message: Small updates to LinearOperatorComposition.  Noticed while writing
  LinearOperatorInversion.
diff: @@ -275,6 +275,3 @@ class LinearOperatorComposition(linear_operator.LinearOperator):
  for operator in solve_order_list[1:]:
  solution = operator.solve(solution, adjoint=adjoint)
  return solution
  -
  - def _add_to_tensor(self, x):
  - return self.to_dense() + x
  