fix bug

@@ -74,7 +74,7 @@ class Command(BaseCommand, LoggerMixin):
 
     def pdf_download(self, doc, business_type):
         if doc is None:
-            return None, None, None
+            return None, None, None, None
         # TODO EDMS下载pdf
         doc_data_path = os.path.join(self.data_dir, business_type, str(doc.id))
         os.makedirs(doc_data_path, exist_ok=True)

@@ -28,7 +28,8 @@ class BSWorkbook(Workbook):
         self.border = Border(left=self.bd, top=self.bd, right=self.bd, bottom=self.bd)
         self.MAX_MEAN = 31
 
-    def sheet_prune(self, ws):
+    @staticmethod
+    def sheet_prune(ws):
         ws.insert_cols(1, amount=consts.FIXED_COL_AMOUNT)
         for col in range(consts.FIXED_COL_AMOUNT + 1, ws.max_column + 1):
             header_value = ws.cell(1, col).value