Yechiel Michel Epstein,
Translation:Arukh ha-Shulchan…
“ That is why the previous chapter mentions that the size of Carpas to be eaten should not exceed an olive-size, and if it did a blessing should not be made over it afterward, since a doubt over a required blessing resolves to the lenient side, as I wrote there. Therefore, the result seen is that a blessing afterward should not be said [due to the doubt over whether the Hagadah is an interruption] . Now, if this is so, consider what is compelling the drinking of the cup of wine? If there is no external reason, the doubt in law [of the Hagadah’s interruption] can be resolved by not drinking. ”
