#159 improved error reporting for document-list (#1180)

- expose ‘error’ event
- change path only on successful navigation
- extend demo shell with error handling and reporting
- additional unit tests for document-list

demo-shell-ng2/app/components/files/files.component.ts

@@ -38,6 +38,7 @@ declare let __moduleName: string;
 export class FilesComponent implements OnInit {
     currentPath: string = '/Sites/swsdp/documentLibrary';
 
+    errorMessage: string = null;
     fileNodeId: any;
     fileShowed: boolean = false;
     multipleFileUpload: boolean = false;
@@ -120,6 +121,16 @@ export class FilesComponent implements OnInit {
         this.router.navigate(['/activiti/tasksnode', event.value.entry.id]);
     }
 
+    onNavigationError(err: any) {
+        if (err) {
+            this.errorMessage = err.message || 'Navigation error';
+        }
+    }
+
+    resetError() {
+        this.errorMessage = null;
+    }
+
     private setupBpmActions(actions: any[]) {
         actions.map(def => {
             let documentAction = new DocumentActionModel();