Missing entrance label in sp3_01

[SacredGhost]

[SeekyCt]

The blank string does actually seem to be an entrance name used by the game, has special behaviour to disable the music when entering with it

[JohnP55]

One could argue that we could add a label that says "(empty string)" or the like

Edit: Github hates caret characters so I replaced them with parentheses to make the text actually show up

[SeekyCt]

Fair