Merge pull request '학습데이터 목록 파일 단위 MB 나오게 하기' (#85) from feat/training_260202 into develop

Reviewed-on: #85

src/main/java/com/kamco/cd/training/dataset/dto/DatasetDto.java

@@ -77,9 +77,16 @@ public class DatasetDto {
     }
 
     public String getTotalSize(Long totalSize) {
-      if (totalSize == null) return "0G";
+      if (totalSize == null || totalSize <= 0) return "0M";
+
       double giga = totalSize / (1024.0 * 1024 * 1024);
-      return String.format("%.2fG", giga);
+
+      if (giga >= 1) {
+        return String.format("%.2fG", giga);
+      } else {
+        double mega = totalSize / (1024.0 * 1024);
+        return String.format("%.2fM", mega);
+      }
     }
 
     public String getStatus(String status) {