small fix

docutranslate/translator/ai_translator/xlsx_translator.py

@@ -90,7 +90,7 @@ class XlsxTranslator(Translator):
         if not cells_to_translate:
             print("\n文件中没有找到需要翻译的纯文本内容。")
             workbook.close()
-            return
+            return self
         # --- 步骤 2: 调用翻译函数 ---
         translated_texts = self.translate_agent.send_segments(original_texts, self.chunk_size)
 
@@ -103,7 +103,7 @@ class XlsxTranslator(Translator):
         if not cells_to_translate:
             print("\n文件中没有找到需要翻译的纯文本内容。")
             workbook.close()
-            return
+            return self
         # --- 步骤 2: 调用翻译函数 ---
         translated_texts = await self.translate_agent.send_segments_async(original_texts, self.chunk_size)