fix: Ask voice question - null handling, answer visibility

- Handle None/empty question_txt from Gradio (was calling .strip() on None)
- Make answer_display visible when returning results
- Use gr.HTML(value=..., visible=True) for proper output updates

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app.py

@@ -942,17 +942,20 @@ with gr.Blocks(title="MomsVoice", css=css_code) as demo:
 
     # 9. Submit question
     def handle_question_submit(question_txt, question_audio_path, paragraphs, slider_val, profile_id):
-        if not question_txt.strip() and question_audio_path is None:
+        q_txt = (question_txt or "").strip()
+        has_audio = question_audio_path is not None and question_audio_path != ""
+
+        if not q_txt and not has_audio:
             answer_html = """
                 <div style="padding: 10px; background: #fef2f2; border: 1px solid #fecaca; border-radius: 10px; font-size: 12px; color: #991b1b;">
                     Please type a question or record one with the microphone.
                 </div>
             """
-            return answer_html, gr.Audio(visible=False)
+            return gr.HTML(value=answer_html, visible=True), gr.Audio(visible=False)
 
         # Step 9: Transcribe audio if text is empty (on-demand ASR)
-        if question_txt.strip():
-            q_text = question_txt.strip()
+        if q_txt:
+            q_text = q_txt
         else:
             try:
                 q_text = transcribe_audio(question_audio_path)
@@ -1009,8 +1012,8 @@ with gr.Blocks(title="MomsVoice", css=css_code) as demo:
             </div>
         """
         if answer_audio_path:
-            return answer_html, gr.Audio(value=answer_audio_path, visible=True)
-        return answer_html, gr.Audio(visible=False)
+            return gr.HTML(value=answer_html, visible=True), gr.Audio(value=answer_audio_path, visible=True)
+        return gr.HTML(value=answer_html, visible=True), gr.Audio(visible=False)
 
     submit_question_btn.click(
         handle_question_submit,