fix unhappy path

nomos-services/consensus/src/tally/unhappy.rs

@@ -40,6 +40,12 @@ impl Tally for NewViewTally {
     ) -> Result<(Self::Qc, Self::Outcome), Self::TallyError> {
         let mut seen = HashSet::new();
         let mut outcome = HashSet::new();
+
+        // return early for leaf nodes
+        if self.settings.threshold == 0 {
+            return Ok(((), outcome));
+        }
+
         while let Some(vote) = vote_stream.next().await {
             // check vote view is valid
             if !vote.vote.view != timeout_qc.view {