[Node Graph] Legend regression: the cluster renaming doesn't work anymore
Summary
The renaming of cluster names does not work. It's a regression.
Steps to reproduce
Open a graph, and open the "Sidebar" with clusters.
What is the current bug behavior?
We can't rename the clusters because it does not save the new name after a page reload.
What is the expected correct behavior?
As before the regression, the cluster renaming have to save the custom name in database...
Relevant logs and/or screenshots
