Neo4j REST API List All Labels returns labels when graph is empty?

Neo4j REST API List All Labels returns labels when graph is empty?

I'm currently working on a REST API wrapper for Neo4j written in node.js.
Why does the REST API return labels of nodes that are removed? Can I get
all labels of existing nodes?
Code can be found at: https://github.com/Stofkn/node-neo4j (main.js method
listAllLabels)