fix bug

@@ -380,13 +380,14 @@ class BSWorkbook(Workbook):
                         if borrow_cell_value in consts.BORROW_OUTLAY_SET:
                             amount_cell.value = -amount_cell.value
                         amount_cell.number_format = numbers.FORMAT_NUMBER_00
-                        same_amount_mapping = amount_mapping.get(date_cell.value, {})
-                        fill_rows = same_amount_mapping.get(-amount_cell.value)
-                        if fill_rows:
-                            amount_fill_row.add(amount_cell.row)
-                            amount_fill_row.update(fill_rows)
-                        amount_mapping.setdefault(date_cell.value, {}).setdefault(
-                            amount_cell.value, []).append(amount_cell.row)
+                        if date_cell is not None:
+                            same_amount_mapping = amount_mapping.get(date_cell.value, {})
+                            fill_rows = same_amount_mapping.get(-amount_cell.value)
+                            if fill_rows:
+                                amount_fill_row.add(amount_cell.row)
+                                amount_fill_row.update(fill_rows)
+                            amount_mapping.setdefault(date_cell.value, {}).setdefault(
+                                amount_cell.value, []).append(amount_cell.row)
 
                 # 3.5.核对结果
                 if amount_success and over_success and amount_cell.row > 2: