Fix booth recounts poll stats discrepancies

Due to technical issues, sometimes users voted in booths and their vote
couldn't be added to the database. So we're including them in the users
with no demographic data.

spec/models/poll/stats_spec.rb

@@ -186,6 +186,34 @@ describe Poll::Stats do
     end
   end
 
+  describe "#total_no_demographic_data" do
+    before do
+      create(:poll_voter, :from_web, poll: poll, user: create(:user, :level_two, gender: nil))
+    end
+
+    context "more registered participants than participants in recounts" do
+      before do
+        create(:poll_recount, :from_booth, poll: poll, total_amount: 1)
+        2.times { create(:poll_voter, :from_booth, poll: poll) }
+      end
+
+      it "returns registered users with no demographic data" do
+        expect(stats.total_no_demographic_data).to eq 1
+      end
+    end
+
+    context "more participants in recounts than registered participants" do
+      before do
+        create(:poll_recount, :from_booth, poll: poll, total_amount: 3)
+        2.times { create(:poll_voter, :from_booth, poll: poll) }
+      end
+
+      it "returns registered users with no demographic data plus users not registered" do
+        expect(stats.total_no_demographic_data).to eq 2
+      end
+    end
+  end
+
   describe "#channels" do
     context "no participants" do
       it "returns no channels" do