What Does the Priest Say Now?

What should the priest do when, during the Eucharistic Prayer, we pray for the Pope and the Bishop by name?

From the Romanitas Press:

"Today Benedict XVI's resignation as Pope took effect. But even in previous days, the question was being asked, what is said in place of the Supreme Pontiff's name during the Canon - at the Te igitur?

The answer can be found in the Missale Romanum in the Ritus servandus in celebratione Missae, title VIII: Of the Canon of the Mass until the Consecration, §2. Here is a translation of the clause in question:

 When he says: una cum famulo tuo Papa nostro N., he mentions the name of the pope: but if the See is vacant the aforesaid words are omitted."