Fix: Add validation before saving student data to database

app.py

@@ -339,9 +339,30 @@ with gr.Blocks(title="AnatomyBot") as demo:
 
     # --- EVENT HANDLERS ---
     
-    # 1. Modal Close
+    # 1. Modal Close - with validation
+    def handle_modal_submit(name, school, year):
+        """Handle modal submission with validation."""
+        # Validate inputs
+        if not name or not name.strip():
+            return gr.update(), "", "", None  # Don't close modal if name is empty
+        if not school or not school.strip():
+            return gr.update(), "", "", None  # Don't close modal if school is empty
+        if not year:
+            return gr.update(), "", "", None  # Don't close modal if year not selected
+        
+        # Save to database
+        save_result = save_student(name.strip(), school.strip(), year)
+        
+        # Return updates
+        return (
+            gr.update(visible=False),  # Close modal
+            f"**Doctor {name}** | {school}",  # Welcome message
+            name,  # Store name in state
+            save_result  # Database save result (True/False)
+        )
+    
     m_btn.click(
-        fn=lambda n,s,y: (gr.update(visible=False), f"**Doctor {n}** | {s}", n, save_student(n,s,y)),
+        fn=handle_modal_submit,
         inputs=[m_name, m_school, m_year],
         outputs=[modal, welcome_msg, student_name, gr.State()], # dummy output for save
         js="""