[SERVER] Alias for empty values give incorrect results

[dbeast-co]

If you write the alias and after that delete it, the result template look like:

 "aliases" : {
    "" : { }
  }

To Reproduce
Steps to reproduce the behavior:

1. In the project settings, defined the project with the alias in the template/index
2. Delete the alias
3. Save and analyze

The alias in the result file look incoorect. He supposed to be empty