fix bulk error for table method (#407)

### What problem does this PR solve?


Issue link:#366

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/app/table.py

@@ -223,8 +223,8 @@ def chunk(filename, binary=None, from_page=0, to_page=10000000000,
                     continue
                 if not str(row[clmns[j]]):
                     continue
-                #if pd.isna(row[clmns[j]]):
-                #    continue
+                if pd.isna(row[clmns[j]]):
+                    continue
                 fld = clmns_map[j][0]
                 d[fld] = row[clmns[j]] if clmn_tys[j] != "text" else huqie.qie(
                     row[clmns[j]])

rag/utils/es_conn.py

@@ -2,6 +2,7 @@ import re
 import json
 import time
 import copy
+
 import elasticsearch
 from elastic_transport import ConnectionTimeout
 from elasticsearch import Elasticsearch