Fix FAQ buttons showing None as display text after PDF upload

app.py

@@ -1099,7 +1099,7 @@ def show_dashboard():
         is_pdf_analysis = False
         if getattr(st.session_state, 'faq_trigger', None):
             prompt = st.session_state.faq_trigger
-            display_prompt = getattr(st.session_state, 'faq_display', prompt)
+            display_prompt = getattr(st.session_state, 'faq_display', None) or prompt
             is_pdf_analysis = (st.session_state.get('faq_display') or '').startswith("I have uploaded")
             st.session_state.faq_trigger = None
             st.session_state.faq_display = None