ui-router for handled link, $window.location for rest

This e.g. fixes exporting to pdf as the ui router does not handle this link

frontend/app/components/routing/wp-show/wp-show.controller.ts

@@ -92,7 +92,12 @@ export class WorkPackageShowController extends WorkPackageViewController {
         this.deleteSelectedWorkPackage();
         break;
       default:
+        var stateForLink = $state.get().filter(state => state.$$state().url.exec(link));
+        if (stateForLink.length > 0) {
           this.$location.path(link);
+        } else {
+          this.$window.location.href = link;
+        }
         break;
     }
   };

frontend/app/components/wp-details/wp-details-toolbar.directive.ts

@@ -103,7 +103,12 @@ function wpDetailsToolbar(
               deleteSelectedWorkPackage();
               break;
             default:
+              var stateForLink = $state.get().filter(state => state.$$state().url.exec(link));
+              if (stateForLink.length > 0) {
                 $location.path(link);
+              } else {
+                $window.location.href = link;
+              }
               break;
           }
         };