Show only the completed submissions

Here is a first stab at it

Drafts seem to be filtered out by default, but when enabling "Include draft submissions", nothing changes, drafts are still not included in the analysis.

The problem occured because the date filter was based on completed date, always excluding drafts.

Created a patch based on changed date (applied to beta10).

I tested and committed this

Automatically closed - issue fixed for 2 weeks with no activity.