Refactor get_papers function to check if papers

app.py

@@ -103,8 +103,8 @@ def get_papers(
     for paper in already_claimed[False]:
         url = f"https://huggingface.co/papers/{paper['id']}"
         results += f"- [{paper['title']}]({url})\n"
-    if len(papers_indexed_by_hf[False]) > 0:
-        results += f"# Papers not yet indexed by Hugging Face\n"
+    if papers_indexed_by_hf.get(False):
+        results += "# Papers not yet indexed by Hugging Face\n"
         for paper in papers_indexed_by_hf[False]:
             paper_title = paper["title"]
             arxiv_id = paper["externalIds"]["ArXiv"]