Fix conflictive debates with no votes

We originally added the `cached_votes_up > 0` in commit 4ce95e273
because back then `cached_votes_up` was used in the denominator. That's
no longer the case, and it doesn't make sense to mark a debate with 1
vote and 10 flags as conflictive but not doing it when the debate has no
votes and 1000 flags.

We're fixing the bug right now because we're about to change the
affected line in order to apply a new rubocop rule.

app/models/concerns/conflictable.rb

@@ -2,7 +2,7 @@ module Conflictable
   extend ActiveSupport::Concern
 
   def conflictive?
-    return false unless flags_count > 0 && cached_votes_up > 0
+    return false unless flags_count > 0
 
     cached_votes_up / flags_count.to_f < 5
   end

spec/models/debate_spec.rb

@@ -452,10 +452,15 @@ describe Debate do
       expect(debate).not_to be_conflictive
     end
 
-    it "returns false when it has not votes up" do
-      debate.update!(cached_votes_up: 0)
+    it "returns false when it has no flags and no votes up" do
+      debate.update!(flags_count: 0, cached_votes_up: 0)
       expect(debate).not_to be_conflictive
     end
+
+    it "returns true when it has flags and no votes up" do
+      debate.update!(cached_votes_up: 0, flags_count: 10)
+      expect(debate).to be_conflictive
+    end
   end
 
   describe "search" do