Update app.py

app.py

@@ -172,7 +172,7 @@ with gr.Blocks(css=css, title="Multi-Engine TTS – Zero-GPU") as demo:
         with gr.Column(elem_id="col-left"):
             engine = gr.Radio(label="Engine",
                               choices=[e for e in ["kokoro","veena","pyttsx3"]
-                                       if globals()[e.upper()+"_OK"]],
+                                       if globals().get({"pyttsx3":"PYT_OK"}.get(e,e.upper()+"_OK"), False)],
                               value="kokoro" if KOKORO_OK else
                                     "veena"  if VEENA_OK  else "pyttsx3")