[유치수] [NOBTS] prevent NPE.

git-svn-id: http://svn.bds.nhncorp.com/pe/hippo-web/trunk@888 84d0f5b1-2673-498c-a247-62c4ff18d310

src/main/java/com/nhn/hippo/web/mapper/SpanMapper.java

@@ -13,6 +13,7 @@ import org.springframework.data.hadoop.hbase.RowMapper;
 import org.springframework.stereotype.Component;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -38,6 +39,11 @@ public class SpanMapper implements RowMapper<List<SpanBo>> {
     @Override
     public List<SpanBo> mapRow(Result result, int rowNum) throws Exception {
         byte[] rowKey = result.getRow();
+        
+        if(rowKey == null) {
+        	return Collections.emptyList();
+        }
+        
         long most = BytesUtils.bytesToFirstLong(rowKey);
         long least = BytesUtils.bytesToSecondLong(rowKey);