Original song author doesn't show up if there is no song author

[CubixL]

Describe the bug
In the song properties, if you leave the song author blank but type in the original song author, that author doesn't show up in the intro message when loading up the song

To Reproduce

1. Create/open a new song
2. Go to "Song Properties" in Settings
3. Write stuff in the Original song author field but leave Song author blank
4. Click "Song info" in Settings or load up the song again
5. The "Originally created by [person]" text doesn't show up

Expected behavior
The text to actually display

Screenshots

[Bentroen]

Fixed in c36a984