fix: 处理错误信息字段的空值和空字符串

更新多个文件以确保错误信息字段在处理时将空字符串和未定义值转换为null，增强数据一致性和展示逻辑。包括前端组件和后端服务的相应调整。

frontend/src/components/CrawlInfo.vue

@@ -26,14 +26,14 @@
         </el-table-column>
         <el-table-column label="状态" width="100">
           <template #default="{ row }">
-            <el-tag :type="row.error ? 'danger' : (row.count > 0 ? 'success' : 'info')">
-              {{ row.error ? '出错' : (row.count > 0 ? '正常' : '无数据') }}
+            <el-tag :type="row.error && row.error.trim() ? 'danger' : (row.count > 0 ? 'success' : 'info')">
+              {{ row.error && row.error.trim() ? '出错' : (row.count > 0 ? '正常' : '无数据') }}
             </el-tag>
           </template>
         </el-table-column>
         <el-table-column label="错误信息" min-width="200">
           <template #default="{ row }">
-            <span v-if="row.error" style="color: #f56c6c">{{ row.error }}</span>
+            <span v-if="row.error && row.error.trim()" style="color: #f56c6c">{{ row.error }}</span>
             <span v-else>-</span>
           </template>
         </el-table-column>
@@ -100,7 +100,7 @@ const activeSources = computed(() => {
 })
 
 const errorSources = computed(() => {
-  return crawlStats.value.filter(item => item.error).length
+  return crawlStats.value.filter(item => item.error && item.error.trim()).length
 })
 
 const formatDate = (dateStr: string | null) => {

src/bids/services/bid.service.ts

@@ -143,7 +143,8 @@ export class BidsService {
       count: item.count,
       latestUpdate: item.latestUpdate,
       latestPublishDate: item.latestPublishDate,
-      error: item.error,
+      // 确保 error 字段正确处理：null 或空字符串都转换为 null，非空字符串保留
+      error: item.error && item.error.trim() !== '' ? item.error : null,
     }));
   }
 }

src/crawler/entities/crawl-info-add.entity.ts

@@ -15,7 +15,7 @@ export class CrawlInfoAdd {
   latestPublishDate: Date | null;
 
   @Column({ type: 'text', nullable: true })
-  error: string;
+  error: string | null;
 
   @CreateDateColumn()
   createdAt: Date;

src/crawler/services/bid-crawler.service.ts

@@ -318,7 +318,8 @@ export class BidCrawlerService {
         source,
         count,
         latestPublishDate,
-        error,
+        // 确保 error 字段正确处理：undefined 或空字符串都转换为 null
+        error: error && error.trim() !== '' ? error : null,
       });
       await this.crawlInfoRepository.save(crawlInfo);
       this.logger.log(`Saved crawl info for ${source}: ${count} items`);