If the citoid map contains pages and no such data was provided by citoid, we should prompt the user to enter a page number.
I think it makes sense. The main issue is that we actually don't have a great way to re-use citations with a page cited in ve in general.
So if we prompt someone to do this, there will be more cases where someone wants to re-use a citation, but it has a page number cited, and they may re-use the citation even though it's citing a different page number.
But I don't think it should stop us from doing it.