lib/head_music/style/mark.rb in head_music-0.11.8 vs lib/head_music/style/mark.rb in head_music-0.11.9

@@ -4,10 +4,11 @@
   def self.for(placement, fitness: nil)
     new(placement.position, placement.next_position, placements: [placement], fitness: fitness)
   end
 
   def self.for_all(placements, fitness: nil)
-    placements = [placements].flatten
+    placements = [placements].flatten.compact
+    return [] if placements.length == 0
     start_position = placements.map { |placement| placement.position }.sort.first
     end_position = placements.map { |placement| placement.next_position }.sort.last
     new(start_position, end_position, placements: placements, fitness: fitness)
   end