fix:修复消息内容为空

mec-biz/src/main/java/com/ym/mec/biz/service/impl/ImGroupServiceImpl.java

@@ -2096,8 +2096,9 @@ public class ImGroupServiceImpl extends BaseServiceImpl<String, ImGroup> impleme
 
     //url路径改造
     public static String urlTypeChange(String url){
-        if (url.isEmpty()){
+        if (StringUtils.isBlank(url)){
             log.warn("url为空");
+            return url;
         }
         String replace;
         if (url.contains("https://ks3-cn-beijing.ksyuncs.com")){