Merge pull request #375 from ArnoldDeRuiter/update-filetree-on-change

Auto-refresh filetree after changes

Prepare new release (software compatibility with 3.20)

Merge pull request #356 from nemunaire/integrations-v2

Software 3.18 compatibility

fix #345

fix dockerfile

- define error response for the ui

- dont serialize integrations empty fields

- some fixes with upload control version

- 404 instead of 500 on blob not found

Merge pull request #299 from ddvk/dependabot/npm_and_yarn/ui/express-…

…4.19.2

Bump express from 4.18.2 to 4.19.2 in /ui

It is expected to return 404 instead of a null root hash

Fixes: #270

Tested on 3.9.3