[SD-1461] fix money_methods for ruby version < 2.7 (#11373)

* SD-1461 fix money_methods for ruby version < 3.0

* SD-1461 change approach

core/app/models/concerns/spree/display_money.rb

@@ -27,7 +27,9 @@ def money_methods(*args)
           define_method("display_#{method_name}") do |**args_list|
             default_opts = respond_to?(:currency) ? { currency: currency } : {}
 
-            Spree::Money.new(send(method_name, **args_list), default_opts.merge(opts).merge(args_list.slice(:currency)))
+            amount = args_list.blank? ? send(method_name) : send(method_name, **args_list)
+
+            Spree::Money.new(amount, default_opts.merge(opts).merge(args_list.slice(:currency)))
           end
         end
       end

core/spec/models/spree/concerns/display_money_spec.rb

@@ -35,6 +35,7 @@ def total(currency:)
             expect(test_class.new.display_total(currency: currency)).to eq Spree::Money.new(10.0, currency: currency)
           end
         end
+
         context 'wrapped method accepts `currency` argument' do
           let(:test_class) do
             Class.new do