- Ignore unknown actions instead of failing
- Don’t fail on duplicated actions

This can only happen when clients don’t use unique ids or are broken

Fixes #120

Error is thrown when Kerberos for Windows is not installed

The SHA of the default avatar will be set as item id attr

Fixes #118

Check if status code is there before checking nickname, otherwise we
get a attribute error when muc_user is None

When the metadata node is disabled, also clear the data node