Steps to Reproduce

1. Open favorite connection of x509 where connection string contains username (it can be taken from previous versions where username was optional)
2. Click to Edit connection string, confirm editing
3. Remove username from the connection string
   --> "You have unsaved changes.[discard][save changes]" message appears
4. Click Save Changes
   Actual Result: edit mode exited, but username is displayed in the connection string again
   Expected Result: edit mode exited, changes to connection string should be saved.
5. Switch to form with fields - More Options
6. Actual Result: Attached certificates disappeared, SSL option has changed to "System CA\Atlas Deployment"
   Expected Result: Attached certificates should not be lost if connection string was updated, right?..