Selecting not yet existing filter throws error message instead of opening edit box

[selyod-ka]

Describe the bug
From a users' / UI perspective, it is not clear that there is a difference between clicking the radio button selecting 'rainloop.user' and clicking 'rainloop.user'.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Filter'
2. Click on radio button 'rainloop.user' before adding/ editing the filter, i.e. on the first time.
3. See error "NO (NONEXISTEN) "Sieve script 'rainloop.user' not found"

Expected behavior
Selecting the rainloop.user filter prior to editing should open the edit box instead of throwing the (technically correct) error message that the filter does not exist.

Please complete the following information:

• SnappyMail Version: 2.27.3 (Nextcloud-App latest)