Is it the soup? Or is the line for the soup?Photo: Melissa HomEater brings news that Momofuku Noodle Bar will be opening the doors of its more spacious new location tomorrow — good news for East Village diners who’ve been waiting in lines out the door at Ramen Setagaya and Rai Rai Ken. Is there some natural connection between Japanese noodle soup and long lines? It would seem to defeat its own purpose when on a cold day one has to first wait and then quiver on a tiny stool — why even leave the house? Especially when, in the case of Setagaya, you can’t get soup to go. Clearly the Momofuku move is a good thing for ramen — unless it turns out that the line is what makes the people come, not the soup.