fix: upload the files to google sheet

src/detect_section_selector_masters/sendDiffToGoogleSheets.ts

@@ -19,7 +19,24 @@ async function uploadAllToSheets() {
   const dirNames = useAiSelectors
     ? ['diffAINavWithBaseline', 'diffAIWithBaseline']
     : ['diffNavWithBaseline', 'diffWithBaseline'];
-  const files = dirNames.flatMap(subdir => {
+    
+  // 拆分主目录(primary)和备用目录(secondary)。
+  // 读取主目录下所有 JSON，检查是否有非空数组。
+  // 如果主目录有内容，只上传主目录文件；否则上传备用目录文件。
+  const [primary, secondary] = dirNames;
+  const primaryDir = join(__dirname, primary);
+  const primaryFiles = readdirSync(primaryDir).filter(f => f.endsWith('.json'));
+  let usePrimary = false;
+  for (const f of primaryFiles) {
+    const raw = readFileSync(join(primaryDir, f), 'utf-8');
+    const data = JSON.parse(raw);
+    if (Array.isArray(data) && data.length > 0) {
+      usePrimary = true;
+      break;
+    }
+  }
+  const dirsToUpload = usePrimary ? [primary] : [secondary];
+  const files = dirsToUpload.flatMap(subdir => {
     const d = join(__dirname, subdir);
     return readdirSync(d)
       .filter(f => f.endsWith('.json'))