创建聊天室调整

core/src/main/java/com/wecloud/im/service/impl/ImConversationServiceImpl.java

@@ -1155,7 +1155,9 @@ public class ImConversationServiceImpl extends BaseServiceImpl<ImConversationMap
         imConversation.setChatType(imConversationCreate.getChatType());
         imConversation.setName(imConversationCreate.getName());
         imConversation.setSystemFlag(false);
+        if (imConversationCreate.getAttributes() != null) {
             imConversation.setAttributes(JsonUtils.encodeJson(imConversationCreate.getAttributes()));
+        }
         imConversationService.save(imConversation);
 
         // 将创建者自己添加到会话