Is the staff during the Friday sermon a condition or a Sunnah, and is there any consequence for an Imam who delivers the sermon without it?

It is recommended for the Imam to lean on a stick or similar object during the sermon, due to the narration by Al-Hakam ibn Hazn that the Prophet, peace and blessings be upon him, stood leaning on a stick or a bow, then he praised Allah and extolled Him. However, this leaning is not a condition for the sermon. So, whoever delivers a sermon without it, there is no fault upon him. He may also hold his left hand with his right or let them hang.