fix

mec-im/src/main/java/com/ym/service/Impl/RoomServiceImpl.java

@@ -1048,7 +1048,7 @@ public class RoomServiceImpl implements RoomService {
     public Boolean display(String roomId, int type, String uri, String targetUserId) throws Exception {
 
         // 重置uri为空字符串
-        if (StringUtils.isBlank(uri)) {
+        if (StringUtils.isBlank(uri) || "null".equals(uri)) {
             uri = "";
         }