Function empty_line 

pub fn empty_line(
    src_lines: &Vec<String>,
    base_indent: usize,
    section_level: &mut usize,
    line_cursor: &mut LineCursor,
    doctree: DocTree,
    captures: &Captures<'_>,
    pattern_name: &Pattern,
) -> TransitionResult

Simply adds an empty line to the children of the curren node.