AT:

• front-end performs a query to the backend to retrieve the report data
• when I create a report no diagram is shown in the report builder. Instead all dropdowns/modals should not have a default selection, but a "please select" option shown
• all possible combinations show a diagram
• if there is no data/process definitions available, the text "no data" is shown

Background:
Now that the backend implements all queries, we should remove the query mock and actually perform the report query in the Reports service