fix anon username

app.py

@@ -10,7 +10,6 @@ from constants import (
     ASSAY_EMOJIS,
     ASSAY_DESCRIPTION,
     EXAMPLE_FILE_DICT,
-    ANONYMOUS_SUBMISSION_USERNAME,
 )
 from about import ABOUT_TEXT, FAQS
 from submit import make_submission
@@ -144,7 +143,7 @@ with gr.Blocks() as demo:
 
             # If username is empty, set to anonymous submission
             username_input.change(
-                fn=lambda x: x if x.strip() else ANONYMOUS_SUBMISSION_USERNAME,
+                fn=lambda x: x if x and x.strip() else None,
                 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
+from constants import API, SUBMISSIONS_REPO, ANONYMOUS_SUBMISSION_USERNAME
 from validation import validate_csv_file, validate_username
 
 
@@ -18,6 +18,7 @@ def make_submission(
     model_name: str = "",
     model_description: str = "",
 ):
+    user_state = user_state or ANONYMOUS_SUBMISSION_USERNAME
     validate_username(user_state)
 
     model_name = model_name.strip()