Update app.py

app.py

@@ -123,7 +123,8 @@ if sentence:
         html = generate_html(pictogram_ids)
         st.components.v1.html(html, height=500, scrolling=True)
 
-        # Container to hold the download button
-        pdf_path = generate_pdf(pictogram_ids)
-        with open(pdf_path, "rb") as pdf_file:
-            st.download_button(label="Télécharger la traduction en PDF", data=pdf_file, file_name="pictograms.pdf", mime="application/pdf")
+if pictogram_ids:
+    # Container to hold the download button
+    pdf_path = generate_pdf(pictogram_ids)
+    with open(pdf_path, "rb") as pdf_file:
+        st.download_button(label="Télécharger la traduction en PDF", data=pdf_file, file_name="pictograms.pdf", mime="application/pdf")