isSuccess() 수정

src/main/java/cokr/xit/foundation/component/ServiceResponse.java

@@ -77,10 +77,8 @@ public abstract class ServiceResponse extends AbstractComponent implements Seria
 	 * </ul>
 	 */
 	public boolean isSuccess() {
-		if (throwable != null)
-			return false;
-
-		return ifEmpty(success, Boolean.TRUE);
+		return throwable == null
+			&& ifEmpty(success, Boolean.TRUE);
 	}
 
 	/**성공여부(디폴트는 true)를 설정한다.