Fix exception from jobs on new environment

[ghost]

Purpose

Some jobs throw exceptions when they were run on empty environment.

Changes

• Avoid calling functions which directly throws exceptions, if database is empty

Checklist

• [x] My code follows the style of this project.
• [ ] The code compiles without warnings.
• [x] I have performed a self-review of the changes.
• [ ] I have documented my code, in particular the intent of the hard-to-understand areas.
• [x] (If necessary) I have updated the CHANGELOG.