Show a hyphen in supplier column if an article is not offered by anyone

Closes #54

prototype/src/main/java/org/hso/ecommerce/controller/intern/suppliers/SupplierOfferController.java

@@ -29,8 +29,8 @@ public class SupplierOfferController {
 		List<UImodelOfferedArticle> totals = new ArrayList<>();
 
 		for (ArticleOffer article : offersRepository.findAll()) {
-			UImodelOfferedArticle tmp = new UImodelOfferedArticle();
-			tmp.addData(article, articleRepository.findArticleIDByRelatedID(article.id));
+			UImodelOfferedArticle tmp = new UImodelOfferedArticle(article,
+					articleRepository.findArticleIDByRelatedID(article.id));
 			totals.add(tmp);
 		}
 
@@ -50,13 +50,17 @@ public class SupplierOfferController {
 		public int listedArticleId;
 		public boolean offerIsListed; // true --> offered article is listed
 
-		public void addData(ArticleOffer article, Optional<Integer> listedArticleId) {
+		public UImodelOfferedArticle(ArticleOffer article, Optional<Integer> listedArticleId) {
 
 			this.offerId = article.id;
 			this.title = article.title;
 			this.manufacturer = article.manufacturer;
 			this.articleNumber = article.articleNumber;
-			this.supplierName = article.cheapestSupplier.name;
+			if (article.cheapestSupplier != null) {
+				this.supplierName = article.cheapestSupplier.name;
+			} else {
+				this.supplierName = "-";
+			}
 			this.price = String.format("%.2f", ((float) article.pricePerUnitNet / 100));
 			this.ads = (article.shouldBeAdvertised) ? "Ja" : "Nein";
 

prototype/src/main/resources/templates/intern/offeredArticles/index.html

@@ -44,7 +44,8 @@
                      <td><span th:text="${article.title}"></span></td>
                      <td><span th:text="${article.manufacturer}"></span></td>
                      <td><span th:text="${article.articleNumber}"></span></td>
-                     <td><a th:href="${'/intern/suppliers/#q=' + article.supplierName}" th:text="${article.supplierName}"></a></td>
+                     <td th:if="${article.supplierName} == '-'">-</td>
+                     <td th:unless="${article.supplierName} == '-'"><a th:href="${'/intern/suppliers/#q=' + article.supplierName}" th:text="${article.supplierName}"></a></td>
                      <td><span th:text="${article.price}"></span> €</td>
                      <td><span th:text="${article.ads}"></span></td>
                      <td>