判断dest是否存在时需要考虑空字符串的时候

@@ -146,7 +146,7 @@ public class SearchRecommendServiceImpl implements ISearchRecommendService {
 				return defaultSuggestRecommendation();
 			}
 
-			JSONObject recommendResult = recommendBySuggestIndex(paramMap, keywordsToSearch, dest != null);
+			JSONObject recommendResult = recommendBySuggestIndex(paramMap, keywordsToSearch, StringUtils.isNotEmpty(dest));
 			if (recommendResult == null || CollectionUtils.isEmpty((List<?>) recommendResult.get("terms_suggestion"))) {
 				recommendResult = defaultSuggestRecommendation();
 			}