fix: protect file list download

src/source/GitHubStream.ts

@@ -169,9 +169,10 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
       `sha ${sha}, countFiles: ${count.file} countRequest: ${count.request}, parentPath: "${parentPath}"`
     );
     count.request++;
-    const data = await this.getGHTree(sha, { recursive: false });
+    let data = null;
 
     try {
+      data = await this.getGHTree(sha, { recursive: false });
       this.tree2Tree(data.tree, truncatedTree, parentPath);
     } catch (error) {
       console.error(error);