paragraph underlining algorithm correction

lib/mmmd/blankshell.rb

@@ -367,8 +367,7 @@ module PointBlank
 
       # (see ::PointBlank::Parsing::NullParser#consume)
       def consume(line, parent = nil, lazy: false)
-        puts line.inspect if lazy
-        @lazy_triggered = lazy || @lazy_triggered
+        @lazy_triggered = lazy || @lazy_triggered unless line.strip.empty?
         return [nil, nil] if line.match?(/\A {0,3}\Z/)
         return [nil, nil] if @closed
         return [nil, nil] if check_candidates(line, parent)