Editing an uploaded yaml with ELN fills yaml with json
It came out from me and @dflor that
if I upload separate "data" and "schema" YAML and I edit my eln fields and save again, my YAML data file (with .yaml extension) contains JSON formatted data
In this unfortunate case, when reprocessing the new data yaml file, I got a failure because the file actually contains json syntax. The gui is then crashing in this case.