Fix $unload from cache

frontend/app/components/api/api-v3/hal-resources/hal-resource.service.ts

@@ -102,7 +102,7 @@ export class HalResource {
 
     // Reset and load this resource
     this.$loaded = false;
-    this.$self = this.$links.self({}, this.$loadHeaders(true)).then(source => {
+    this.$self = this.$links.self({}, this.$loadHeaders(force)).then(source => {
       this.$loaded = true;
       this.$initialize(source);
       return this;
@@ -111,11 +111,6 @@ export class HalResource {
     return this.$self;
   }
 
-  public $unload() {
-    this.$loaded = false;
-    this.$self = null;
-  }
-
   public $plain() {
     return angular.copy(this.$source);
   }

frontend/app/components/work-packages/work-package-cache.service.ts

@@ -74,7 +74,7 @@ export class WorkPackageCacheService {
    */
   loadWorkPackageLinks(workPackage, ...args: string[]) {
     args.forEach((arg) => {
-      workPackage[arg].$unload();
+      workPackage[arg].$load(true);
     });
     return this.updateWorkPackage(workPackage);
   }