Did Hind bint Utbah eat the liver of Hamza ibn Abd al-Muttalib?

The story of Hind mutilating Hamza is well-known, and scholars have differed on its authenticity. Ibn Ishaq mentioned it with a mursal (indirect) chain, and Imam Ahmad narrated it with a chain that has weakness due to Ata' ibn as-Sa'ib. However, Ahmad Shakir deemed it authentic, and Shu'ayb al-Arna'ut and Alawi al-Saqqaf considered it good. Hammad ibn Salamah heard from Ata' both before and after his memory deteriorated. Assuming its authenticity, Hind embraced Islam and her conversion was good, and Islam nullifies what came before it.