Add validation for positive_arxiv_ids input in

app.py

@@ -83,6 +83,8 @@ def get_papers(
 ):
     if not hf_user_name:
         raise gr.Error("You must be logged in to use this Space")
+    if not positive_arxiv_ids:
+        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(",")
     potential_authors = query_author(author_name)
@@ -152,7 +154,7 @@ with gr.Blocks() as demo:
     )
     positive_arxiv_ids = gr.Textbox(
         placeholder="1910.01108",
-        label="ArXiv ID for a paper for which you are an author",
+        label="ArXiv ID for a paper for which you are an author, separate multiple IDs with commas",
         interactive=True,
     )
     btn = gr.Button("Get papers")