Relation.setInfo(..) 수정

src/main/java/cokr/xit/base/file/FileInfo.java

@@ -98,7 +98,8 @@ public class FileInfo extends AbstractEntity {
 		public void setInfo(FileInfo fileInfo) {
 			fileInfo.setInfoType(Assert.notEmpty(infoType, "infoType"));
 			fileInfo.setInfoKey(Assert.notEmpty(infoKey, "infoKey"));
-			fileInfo.setSubType(subType);
+			if (!Assert.isEmpty(subType))
+				fileInfo.setSubType(subType);
 		}
 	}