FIX bug

@@ -108,11 +108,11 @@ class Command(BaseCommand, LoggerMixin):
             if zip_doc is None:
                 self.online_log.warn('{0} [zip_2_pdfs] [doc not exist] [task_str={1}]'.format(
                     self.log_base, task_str))
-                return None, business_type
+                return None, business_type, None
             elif zip_doc.status != DocStatus.INIT.value:
                 self.online_log.warn('{0} [zip_2_pdfs] [doc status error] [task_str={1}] [doc_status={2}]'.format(
                     self.log_base, task_str, zip_doc.status))
-                return None, business_type
+                return None, business_type, None
 
             zip_doc.status = DocStatus.PROCESSING.value
             zip_doc.start_time = timezone.now()
@@ -120,7 +120,7 @@ class Command(BaseCommand, LoggerMixin):
         except Exception as e:
             self.online_log.error('{0} [process error (zip_2_pdfs)] [error={1}]'.format(
                 self.log_base, traceback.format_exc()))
-            return None, None
+            return None, None, None
         else:
             self.online_log.info('{0} [zip_2_pdfs] [db save end] [task_str={1}]'.format(
                 self.log_base, task_str))