If every paragraph in a book has a blank line before or after it, you can ignore those. If the blank line is being used as a break in context, then rule 1.9 applies and that blank line is retained in braille. With the blank lines before/after a print page, the same concept is true. If it represents a break in context or a change in thought, then retain it. If it is consistently that way throughout the book but does not appear to represent a change in context, ignore it.
Cindi