AD sync and credentials

[velden]

Next step I selected my - already present - credential for the 'Untrusted domain' (NOT the one in Settings but the one under 'Credentials').
As I wrote before I don't like to save passwords (especially not those of important admin accounts) so all my Credential objects are setup with 'Always prompt for password'.
Seems this makes the sync go wrong too with a 'Object reference not set to an instance of an object' error.

Suggestions:
- make it possible to use a Credential without saved password

Thanks for fixing this! (tested in 10.1.5630.1)