make sure student ID and csv are not empty

app.py

@@ -94,7 +94,7 @@ with demo:
                 gr.Markdown("## Submit Your Results")
                 
                 with gr.Row():
-                    student_id = gr.Textbox(label="Student ID")
+                    student_id = gr.Textbox(label="Student ID", value='455')
                     model_name = gr.Textbox(label="Model Name", value='pixelCNN++')
                     csv_upload = gr.UploadButton(
                         label="Upload Predictions CSV",

src/submission/submit.py

@@ -80,6 +80,12 @@ def process_submission(
 
     submitted_time = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
 
+    if not student_id.strip():
+        return styled_error("Submission failed! Student ID cannot be empty!")
+
+    if csv_upload is None:
+        return styled_error("Submission failed! CSV file cannot be empty!")
+
     # Seems good, creating the eval
     print("Adding new eval request")