List roundtrip adds extra line.

[AldaronLau]

Here's the original muon:

composer: Jeron Aldaron Lau
lyricist: Jeron Aldaron Lau
arranger: Jeron Aldaron Lau
movement:: The Beginning
        :: Part II
        : Finale

After the roundtrip, the list of strings becomes:

movement:: The Beginning
        :
        :: Part II
        : Finale

Same code from #1

[DougLau]

Fixed in 45a183c