Strip whitespace from positive_arxiv_ids list.

app.py

@@ -87,6 +87,8 @@ def get_papers(
         raise gr.Error("You must enter at least one ArXiv ID")
     hf_user_name = hf_user_name.preferred_username
     positive_arxiv_ids = positive_arxiv_ids.split(",")
+    # strip whitespace
+    positive_arxiv_ids = [arxiv_id.strip() for arxiv_id in positive_arxiv_ids]
     potential_authors = query_author(author_name)
     if not potential_authors:
         raise gr.Error("No authors found with that name")