Easy way to handle empty passwords in devise

users_controller.rb

    # Never trust parameters from the scary internet, only allow the white list through.
    def user_params
      real_params = params.require(:user).permit(:email, :password, :password_confirmation, :role, :note)
      if real_params[:password].blank?
        real_params.delete(:password)
        real_params.delete(:password_confirmation)
      end

      real_params
    end