show message when ignoring articles due to missing order number

app/controllers/articles_controller.rb

@@ -227,6 +227,7 @@ class ArticlesController < ApplicationController
     if @updated_articles.empty? && @outlisted_articles.empty?
       redirect_to supplier_articles_path(@supplier), :notice => I18n.t('articles.controller.sync.notice')
     end
+    @ignored_article_count = @supplier.articles.where(order_number: [nil, '']).count
   end
 
   # Updates, deletes articles when sync form is submitted

app/views/articles/sync.html.haml

@@ -14,6 +14,8 @@
             .alert= t '.alert_used', article: article.name
   - else
     %i= t '.outlist.body_skip'
+  - if @ignored_article_count > 0
+    %i= t '.outlist.body_ignored', count: @ignored_article_count
   %hr/
   %h2= t '.update.title'
   %p

config/locales/en.yml

@@ -375,6 +375,9 @@ en:
       outlist:
         alert_used: Warning, %{article} is used in an open order. Please remove it from the order first.
         body: ! 'The following articles were removed from the list and will be <b>deleted</b>:'
+        body_ignored:
+          one: One article without order number was skipped.
+          other: ! '%{count} articles without order number were skipped.'
         body_skip: No articles to delete.
         title: Remove from list ...
       price_short: Price