Fix problem with a [nil] result being taken as having a winner; add testcases

[rubyvote] / lib / rubyvote / irv.rb

diff --git a/lib/rubyvote/irv.rb b/lib/rubyvote/irv.rb
index 38517381e2591770188aec70abec6f2d147adf61..c3fabe6e488de75352c1ae53305e0a1b0785022c 100644 (file)
--- a/lib/rubyvote/irv.rb
+++ b/lib/rubyvote/irv.rb
@@ -87,6 +87,11 @@ class InstantRunoffResult < ElectionResult
       apply_retention(votes, votes_sum * params['percent_retention'])
     end
     
+    unless votes.length > 0
+      @winners=[]
+      return
+    end
+
     begin
       ranked_candidates = votes.sort do |a, b|
         b[1][0] <=> a[1][0]