refactor: 优化组件和API的空值处理逻辑

- 在KnowledgeGraphSection和QuerySection组件中添加事件声明
- 移除mindmap_router和knowledge_router中不必要的404异常抛出
- 在SearchConfigModal中增加databaseId为空时的处理逻辑
- 在KnowledgeBaseCard中优化描述显示和样式调整

server/routers/knowledge_router.py

@@ -1132,9 +1132,6 @@ async def get_sample_questions(db_id: str, current_user: User = Depends(get_admi
         db_meta = knowledge_base.global_databases_meta[db_id]
         questions = db_meta.get("sample_questions", [])
 
-        if not questions:
-            raise HTTPException(status_code=404, detail="该知识库还没有生成测试问题")
-
         return {
             "message": "success",
             "questions": questions,

server/routers/mindmap_router.py

@@ -347,9 +347,6 @@ async def get_database_mindmap(db_id: str, current_user: User = Depends(get_admi
         db_meta = knowledge_base.global_databases_meta[db_id]
         mindmap_data = db_meta.get("mindmap")
 
-        if not mindmap_data:
-            raise HTTPException(status_code=404, detail="该知识库还没有生成思维导图")
-
         return {
             "message": "success",
             "mindmap": mindmap_data,

web/src/components/KnowledgeBaseCard.vue

@@ -5,6 +5,7 @@
       <div class="header-left">
         <a-button
           @click="backToDatabase"
+          class="back-button"
           shape="circle"
           :icon="h(LeftOutlined)"
           type="text"
@@ -33,8 +34,8 @@
     <!-- 卡片内容 -->
     <div class="card-content">
       <!-- 描述文本 -->
-      <div class="description" v-if="database.description">
-        <p class="description-text">{{ database.description }}</p>
+      <div class="description">
+        <p class="description-text">{{ database.description || '暂无描述' }}</p>
       </div>
 
       <!-- Tags -->
@@ -66,7 +67,7 @@
       <a-form-item label="知识库描述" name="description">
         <a-textarea v-model:value="editForm.description" placeholder="请输入知识库描述" :rows="4" />
       </a-form-item>
-      
+
       <a-form-item label="自动生成问题" name="auto_generate_questions">
         <a-switch v-model:checked="editForm.auto_generate_questions" checked-children="开启" un-checked-children="关闭" />
         <span style="margin-left: 8px; font-size: 12px; color: var(--gray-500);">上传文件后自动生成测试问题</span>
@@ -165,7 +166,7 @@ const showEditModal = () => {
   editForm.name = database.value.name || '';
   editForm.description = database.value.description || '';
   editForm.auto_generate_questions = database.value.additional_params?.auto_generate_questions || false;
-  
+
   // 如果是 LightRAG 类型，加载当前的 LLM 配置
   if (database.value.kb_type === 'lightrag') {
     const llmInfo = database.value.llm_info || {};
@@ -244,9 +245,14 @@ const deleteDatabase = () => {
   .header-left {
     display: flex;
     align-items: center;
-    gap: 8px;
+    gap: 4px;
     flex: 1;
     min-width: 0;
+
+    button.back-button {
+      margin-left: -5px;
+      font-size: 10px;
+    }
   }
 
   .card-title {
@@ -267,10 +273,12 @@ const deleteDatabase = () => {
     flex-shrink: 0;
 
     button {
+      color: var(--gray-500);
       height: 100%;
     }
 
     button:hover {
+      color: var(--gray-700);
       background-color: var(--gray-100);
     }
   }

web/src/components/KnowledgeGraphSection.vue

@@ -95,6 +95,9 @@ const props = defineProps({
   },
 });
 
+// 声明事件
+const emit = defineEmits(['toggleVisible']);
+
 const store = useDatabaseStore();
 
 const databaseId = computed(() => store.databaseId);

web/src/components/QuerySection.vue

@@ -183,6 +183,9 @@ const props = defineProps({
   },
 });
 
+// 声明事件
+const emit = defineEmits(['toggleVisible']);
+
 const searchLoading = computed(() => store.state.searchLoading);
 const queryResult = ref('');
 const showRawData = ref(true);

web/src/components/SearchConfigModal.vue

@@ -83,7 +83,7 @@ const props = defineProps({
   },
   databaseId: {
     type: String,
-    required: true
+    default: ''
   }
 });
 
@@ -129,6 +129,13 @@ const loadQueryParams = async () => {
     loading.value = true;
     error.value = '';
 
+    // 如果没有 databaseId，不执行请求
+    if (!props.databaseId) {
+      queryParams.value = [];
+      loading.value = false;
+      return;
+    }
+
     const response = await queryApi.getKnowledgeBaseQueryParams(props.databaseId);
     queryParams.value = response.params?.options || [];
 
@@ -163,6 +170,8 @@ const loadQueryParams = async () => {
 
 // 加载保存的配置
 const loadSavedConfig = () => {
+  if (!props.databaseId) return;
+
   const saved = localStorage.getItem(`search-config-${props.databaseId}`);
   if (saved) {
     try {
@@ -201,6 +210,12 @@ const resetToDefaults = () => {
 
 // 保存配置
 const handleSave = async () => {
+  // 如果没有 databaseId，不执行保存
+  if (!props.databaseId) {
+    message.error('无法保存配置：缺少知识库ID');
+    return;
+  }
+
   // 确保 include_distances 始终为 true
   meta['include_distances'] = true;