perf: 优化返回处理

STranslateDLL/LocalMode.cs

@@ -69,12 +69,15 @@ public class LocalMode
         }
 
         var deeplResp = JsonConvert.DeserializeObject<DeepLResponse>(responseBody);
+
         var response = new Response
         {
-            Code = resp.StatusCode.GetHashCode(),
-            Data = deeplResp?.Result?.Texts?.FirstOrDefault()?.Text ?? deeplResp?.Error?.Message ?? "Empty Response"
+            Code = resp.StatusCode.GetHashCode()
         };
 
+        string defaultMessage = resp.StatusCode == System.Net.HttpStatusCode.OK ? "Empty Result" : "Empty Error Message";
+        response.Data = deeplResp?.Result?.Texts?.FirstOrDefault()?.Text ?? deeplResp?.Error?.Message ?? defaultMessage;
+
         return JsonConvert.SerializeObject(response);
     }