Pope Leo is unable to convince Attila not to attack Italy

What would have happened had Leo's mission to Attila fails and Attila attacks Italy? Would Rome fall and the Papacy be discredited?

There are two possibilities for the POD: Leo never goes, or Leo goes and is unable to prevent Attila from attacking.
 
The pope owns far more credit than he is due.Attila retreated because of first a malaria outbreak,second a scarcity of food,third his backyard was on fire--an Eastern Roman army just defeated one of his armies arond the Danube and invaded his homeland.
 
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