fix some chord spacing

verses_with_chords.ly

@@ -330,8 +330,9 @@
               \NullVoice
               \consists Rest_engraver
               \omit Rest
-             % \undo \omit NoteHead
-             % \hide NoteHead
+              \undo \omit NoteHead
+              \hide NoteHead
+              \override NoteHead.X-extent = #'(0 . 0)
             }
           }
         }