QA-04: Empty Validator Set Can Be Accepted in ValidatorSetFactory

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fn create(
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    &self,
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    validators: Vec<(NodeId<Self::NodeIdPubKey>, Stake)>,
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) -> Result<Self::ValidatorSetType, Self::NodeIdPubKey> {
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    let mut vmap = BTreeMap::new();
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    let mut total_stake = Stake::ZERO;
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    for (node_id, stake) in validators.into_iter() {
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        let duplicate = vmap.insert(node_id, stake);
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        if duplicate.is_some() {
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            return Err(ValidatorSetError::DuplicateValidator(node_id));
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        }
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        total_stake += stake;
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    }
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    Ok(ValidatorSet {
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        validators: vmap,
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        total_stake,
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    })
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}