Resolve "Display datasets with cone search enabled"

Closes #125 (closed)

src/app/metamodel/effects/attribute.effects.ts

@@ -42,14 +42,14 @@ export class AttributeEffects {
         ofType(attributeActions.LOAD_MULTIPLE_ATTRIBUTE_LISTS),
         switchMap((action: attributeActions.LoadMultipleAttributeListsAction) => {
             let requests: Observable<any>[] = [];
-            action.payload.map(dname => {
+            action.payload.forEach(dname => {
                 requests.push(this.attributeService.retrieveAttributeList(dname));
             });
             return forkJoin(requests);
         }),
         switchMap((data: { datasetName: string, attributeList: Attribute[] }[]) => {
             let attributesByDataset: AttributesByDataset[] = [];
-            data.map(d => {
+            data.forEach(d => {
                 const attributeList: AttributesByDataset = {
                     datasetName: d.datasetName,
                     isLoading: false,