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If one wants to get only the first tag getTag() should be used
This change also helps for typing hints

- 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

- Don’t allow type=error
- Don’t set from attribute

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