Log error when something goes wrong

Plus spec.
The old implementation would swallow the error, all we had was a flash
message feedback

app/controllers/spree/admin/payments_controller.rb

@@ -59,6 +59,7 @@ module Spree
           flash[:error] = t(:cannot_perform_operation)
         end
       rescue StandardError => e
+        logger.error e.message
         flash[:error] = e.message
       ensure
         redirect_to request.referer

spec/requests/spree/admin/payments_spec.rb

@@ -107,7 +107,7 @@ describe Spree::Admin::PaymentsController, type: :request do
         allow(payment).to receive(:void_transaction!).and_raise(StandardError, "Unexpected !")
       end
 
-      pending "log the error message" do
+      it "log the error message" do
         # The redirect_do also calls Rails.logger.error
         expect(Rails.logger).to receive(:error).with("Unexpected !").ordered
         expect(Rails.logger).to receive(:error).with(/Redirected/).ordered