val nan 일때 오류 수정, spotless 적용

src/main/java/com/kamco/cd/training/model/service/ModelTrainMngService.java

@@ -51,10 +51,10 @@ public class ModelTrainMngService {
 
   @Value("${train.docker.response_dir}")
   private String responseDir;
+
   @Value("${train.docker.symbolic_link_dir}")
   private String symbolicDir;
 
-
   /**
    * 모델학습 조회
    *

src/main/java/com/kamco/cd/training/train/service/TmpDatasetService.java

@@ -19,6 +19,7 @@ public class TmpDatasetService {
 
   @Value("${train.docker.symbolic_link_dir}")
   private String symbolicDir;
+
   /**
    * train, val, test 폴더별로 link
    *