Fix interaction between --exclusion parcels_by_order and --min-threshold when excluding candidates with 0 votes

src/stv/gregory.rs

@@ -510,9 +510,9 @@ where
 		}
 		ExclusionMethod::ParcelsByOrder => {
 			// Exclude by parcel by order
-			if excluded_candidates.len() > 1 {
+			if excluded_candidates.len() > 1 && excluded_candidates.iter().any(|c| !state.candidates[c].parcels.is_empty()) {
 				// TODO: We can probably support this actually
-				panic!("--exclusion parcels_by_order is incompatible with --bulk-exclude");
+				panic!("--exclusion parcels_by_order is incompatible with multiple exclusions");
 			}
 			
 			let count_card = state.candidates.get_mut(excluded_candidates[0]).unwrap();