OZG-6741 set default value for origin pattern

alfa-service/src/main/java/de/ozgcloud/alfa/collaboration/OrganisationsEinheitController.java

@@ -54,7 +54,7 @@ class OrganisationsEinheitController {
 		return ResponseEntity.of(Optional.of(service.getById(organisationsEinheitId)).map(assembler::toModel));
 	}
 
-	@CrossOrigin(originPatterns = "${ozgcloud.domain.url-pattern}")
+	@CrossOrigin(originPatterns = "${ozgcloud.domain.url-pattern:https://*.ozg-cloud.de}")
 	@GetMapping(params = { SEARCH_BY_PARAM })
 	public CollectionModel<EntityModel<OrganisationsEinheitHeader>> search(@RequestParam String searchBy) {
 		return headerModelAssembler.toCollectionModel(service.searchOrganisationsEinheiten(searchBy).toList());