fix:优化

src/modules/conversation-content/DialogContent.vue

@@ -121,6 +121,6 @@ const toShowMindMap = () => {
 }
 
 .mind-map-btn {
-  border-radius: 12px;
+  border-radius: 8px;
 }
 </style>

src/views/conversation/ConversationChatContainer.vue

@@ -737,7 +737,7 @@ const mind_map = ref();
  *
  * */
 const mindMap_content = ref('');
-const mindMap_err = ref('暂无内容');
+const mindMap_err = ref('');
 /**
  * 图谱的查询 文本字段
  * */