Blank lines are not kept in SongView

[faniry6]

Describe the bug
According to the original ChordSheetJS, one can just use blank line to separate verses instead of {start_of_verse} {end_of_verse} delimiter. This is not the case here, it seems like the CustomHtmlDivFormatter is ignoring the blank line such that

chord[A]pro
// Blank line
chord[B]pro

is render as

      A
chordpro
      B    // Blank line ignored 
chordpro

To Reproduce
Steps to reproduce the behavior:

1. Go to SongList
2. Click on + button
3. Create a Chordpro or ChordSheet using blank line as verse separator
4. Save and see result

Expected behavior
Should be similar to this https://martijnversluis.github.io/ChordFiddle/ when using blank line