Fix bug when excluding candidate with 0 votes

src/stv/mod.rs

@@ -445,6 +445,9 @@ where
 		panic!("Invalid --exclusion");
 	}
 	
+	let mut checksum = N::new();
+	
+	if votes.len() > 0 {
 		let value = &votes[0].value / &votes[0].ballot.orig_value;
 		
 		// Count next preferences
@@ -457,8 +460,6 @@ where
 		}
 		
 		// Transfer candidate votes
-	let mut checksum = N::new();
-	
 		for (candidate, entry) in result.candidates.into_iter() {
 			let parcel = entry.votes as Parcel<N>;
 			let count_card = state.candidates.get_mut(candidate).unwrap();
@@ -491,7 +492,10 @@ where
 			count_card.transfer(&-result.total_votes);
 			
 			// By definition, there is no loss by fraction
-	} else {
+		}
+	}
+	
+	if votes_remaining == 0 {
 		// Finalise candidate votes
 		let count_card = state.candidates.get_mut(excluded_candidate).unwrap();
 		checksum -= &count_card.votes;