判空字符串

lib/services/http.dart

@@ -245,7 +245,7 @@ class _RequestInterceptor extends Interceptor {
             Console.log('----------403---------access_token-------------------------${UserStore.to.accessToken}--------------------');
             msg = '$statusCode - Unauthorized';
             final newToken = await refreshToken();
-            if (newToken != null) {
+            if (newToken != null && newToken.isNotEmpty) {
               final RequestOptions requestOptions = err.requestOptions;
               final headers = requestOptions.headers;
               headers['Authorization'] = newToken;