tidy up default to anon submission

app.py

@@ -10,6 +10,7 @@ from constants import (
     ASSAY_EMOJIS,
     ASSAY_DESCRIPTION,
     EXAMPLE_FILE_DICT,
+    ANONYMOUS_SUBMISSION_USERNAME,
 )
 from about import ABOUT_TEXT, FAQS
 from submit import make_submission
@@ -110,10 +111,6 @@ with gr.Blocks() as demo:
             submission_type_state = gr.State(value="GDPa1")
             download_file_state = gr.State(value=EXAMPLE_FILE_DICT["GDPa1"])
 
-            login_button = gr.LoginButton(
-                value="Sign in with Hugging Face to see account name"
-            )  # Note(Lood): Is this mandatory?
-
             with gr.Row():
                 with gr.Column():
                     username_input = gr.Textbox(
@@ -145,9 +142,9 @@ with gr.Blocks() as demo:
                     )
                     submission_file = gr.File(label="Submission CSV")
 
-            # TODO(Lood): How do we get the username from the login button instead? Do we want this?
+            # If username is empty, set to anonymous submission
             username_input.change(
-                fn=lambda x: x if x.strip() else None,
+                fn=lambda x: x if x.strip() else ANONYMOUS_SUBMISSION_USERNAME,
                 inputs=username_input,
                 outputs=user_state,
             )

submit.py

@@ -7,7 +7,7 @@ import gradio as gr
 from datetime import datetime
 import uuid
 
-from constants import API, SUBMISSIONS_REPO, ANONYMOUS_SUBMISSION_USERNAME
+from constants import API, SUBMISSIONS_REPO
 from validation import validate_csv_file, validate_username
 
 
@@ -18,8 +18,6 @@ def make_submission(
     model_name: str = "",
     model_description: str = "",
 ):
-    # If no username is provided, assume anonymous submission
-    user_state = user_state or ANONYMOUS_SUBMISSION_USERNAME
     validate_username(user_state)
 
     model_name = model_name.strip()