Merge pull request DSpace#2271 from kshepherd/item_status_page_config_fix

ItemStatus component should handle missing config gracefully

Author: tdonohue

src/app/item-page/edit-item-page/item-status/item-status.component.ts

@@ -9,9 +9,9 @@ import { RemoteData } from '../../../core/data/remote-data';
 import { getItemEditRoute, getItemPageRoute } from '../../item-page-routing-paths';
 import { AuthorizationDataService } from '../../../core/data/feature-authorization/authorization-data.service';
 import { FeatureID } from '../../../core/data/feature-authorization/feature-id';
-import { hasValue } from '../../../shared/empty.util';
+import { hasValue, isNotEmpty } from '../../../shared/empty.util';
 import {
-  getAllSucceededRemoteDataPayload, getFirstSucceededRemoteData, getRemoteDataPayload,
+  getAllSucceededRemoteDataPayload, getFirstCompletedRemoteData, getFirstSucceededRemoteData, getRemoteDataPayload,
 } from '../../../core/shared/operators';
 import { IdentifierDataService } from '../../../core/data/identifier-data.service';
 import { Identifier } from '../../../shared/object-list/identifier-data/identifier.model';
@@ -105,12 +105,13 @@ export class ItemStatusComponent implements OnInit {
 
       // Observable for configuration determining whether the Register DOI feature is enabled
       let registerConfigEnabled$: Observable<boolean> = this.configurationService.findByPropertyName('identifiers.item-status.register-doi').pipe(
-        getFirstSucceededRemoteData(),
-        getRemoteDataPayload(),
-        map((enabled: ConfigurationProperty) => {
-          if (enabled !== undefined && enabled.values) {
-            return true;
+        getFirstCompletedRemoteData(),
+        map((rd: RemoteData<ConfigurationProperty>) => {
+          // If the config property is exposed via rest and has a value set, return it
+          if (rd.hasSucceeded && hasValue(rd.payload) && isNotEmpty(rd.payload.values)) {
+            return rd.payload.values[0] === 'true';
           }
+          // Otherwise, return false
           return false;
         })
       );