[CST-5729] Fix issue with undefined link type

Author: atarix83

src/app/bitstream-page/bitstream-download-page/bitstream-download-page.component.ts

@@ -107,6 +107,7 @@ export class BitstreamDownloadPageComponent implements OnInit {
           let links = '';
 
           signpostingLinks.forEach((link: SignpostingLink) => {
+            links = links + (isNotEmpty(links) ? ', ' : '') + `<${link.href}> ; rel="${link.rel}"` + (isNotEmpty(link.type) ? ` ; type="${link.type}" ` : ' ');
             links = links + (isNotEmpty(links) ? ', ' : '') + `<${link.href}> ; rel="${link.rel}" ; type="${link.type}" `;
           });
 

src/app/item-page/simple/item-page.component.spec.ts

@@ -49,7 +49,7 @@ const mocklink = {
 const mocklink2 = {
   href: 'http://test2.org',
   rel: 'rel2',
-  type: 'type2'
+  type: undefined
 };
 
 const mockSignpostingLinks: SignpostingLink[] = [mocklink, mocklink2];
@@ -176,13 +176,18 @@ describe('ItemPageComponent', () => {
 
       // Check if linkHeadService.addTag() was called with the correct arguments
       expect(linkHeadService.addTag).toHaveBeenCalledTimes(mockSignpostingLinks.length);
-      expect(linkHeadService.addTag).toHaveBeenCalledWith(mockSignpostingLinks[0] as LinkDefinition);
-      expect(linkHeadService.addTag).toHaveBeenCalledWith(mockSignpostingLinks[1] as LinkDefinition);
+      let expected: LinkDefinition = mockSignpostingLinks[0] as LinkDefinition;
+      expect(linkHeadService.addTag).toHaveBeenCalledWith(expected);
+      expected = {
+        href: 'http://test2.org',
+        rel: 'rel2'
+      };
+      expect(linkHeadService.addTag).toHaveBeenCalledWith(expected);
     });
 
     it('should set Link header on the server', () => {
 
-      expect(serverResponseService.setHeader).toHaveBeenCalledWith('Link', '<http://test.org> ; rel="rel1" ; type="type1" , <http://test2.org> ; rel="rel2" ; type="type2" ');
+      expect(serverResponseService.setHeader).toHaveBeenCalledWith('Link', '<http://test.org> ; rel="rel1" ; type="type1" , <http://test2.org> ; rel="rel2" ');
     });
 
   });

src/app/item-page/simple/item-page.component.ts

@@ -20,7 +20,7 @@ import { ServerResponseService } from '../../core/services/server-response.servi
 import { SignpostingDataService } from '../../core/data/signposting-data.service';
 import { SignpostingLink } from '../../core/data/signposting-links.model';
 import { isNotEmpty } from '../../shared/empty.util';
-import { LinkHeadService } from '../../core/services/link-head.service';
+import { LinkDefinition, LinkHeadService } from '../../core/services/link-head.service';
 
 /**
  * This component renders a simple item page.
@@ -111,12 +111,17 @@ export class ItemPageComponent implements OnInit, OnDestroy {
         this.signpostingLinks = signpostingLinks;
 
         signpostingLinks.forEach((link: SignpostingLink) => {
-          links = links + (isNotEmpty(links) ? ', ' : '') + `<${link.href}> ; rel="${link.rel}" ; type="${link.type}" `;
-          this.linkHeadService.addTag({
+          links = links + (isNotEmpty(links) ? ', ' : '') + `<${link.href}> ; rel="${link.rel}"` + (isNotEmpty(link.type) ? ` ; type="${link.type}" ` : ' ');
+          let tag: LinkDefinition = {
             href: link.href,
-            type: link.type,
             rel: link.rel
-          });
+          };
+          if (isNotEmpty(link.type)) {
+            tag = Object.assign(tag, {
+              type: link.type
+            });
+          }
+          this.linkHeadService.addTag(tag);
         });
 
         if (isPlatformServer(this.platformId)) {