Yeah - oops! I should have documented that part of the software 'compilation' build phase: I add a little something to the package.json
at build time, it gets imported by the program at run time to be able to display that part at startup in the log pane:

It's not required to run smoothly (will silently omit the git branch and hash if absent from the package.json at runtime)
When I commit, I always remove it beforehand...
I guess I should only add this when running a production build. Or I should have at the very least document it in the CONTRIBUTING.md file!!
Many thanks to Viktor to shed some light on this! I created issue 51 on the github's project page so I dont forget to address this.
Félix