Minor clean up watcher util (#1270)

Author: wind57

spring-cloud-kubernetes-controllers/spring-cloud-kubernetes-configuration-watcher/src/main/java/org/springframework/cloud/kubernetes/configuration/watcher/WatcherUtil.java

@@ -104,19 +104,11 @@ static Set<String> apps(KubernetesObject kubernetesObject, String annotationName
 	}
 
 	static Map<String, String> labels(KubernetesObject kubernetesObject) {
-		V1ObjectMeta metadata = kubernetesObject.getMetadata();
-		if (metadata == null) {
-			return Map.of();
-		}
-		return Optional.ofNullable(metadata.getLabels()).orElse(Map.of());
+		return Optional.ofNullable(kubernetesObject.getMetadata()).map(V1ObjectMeta::getLabels).orElse(Map.of());
 	}
 
 	static Map<String, String> annotations(KubernetesObject kubernetesObject) {
-		V1ObjectMeta metadata = kubernetesObject.getMetadata();
-		if (metadata == null) {
-			return Map.of();
-		}
-		return Optional.ofNullable(metadata.getAnnotations()).orElse(Map.of());
+		return Optional.ofNullable(kubernetesObject.getMetadata()).map(V1ObjectMeta::getAnnotations).orElse(Map.of());
 	}
 
 	private static void schedule(String type, String appName, long refreshDelay,