fix(Commentaire.sent_by?): &.email compared to nil could sent by true when nil==nil, avoid this one

app/models/commentaire.rb

@@ -75,7 +75,7 @@ class Commentaire < ApplicationRecord
   end
 
   def sent_by?(someone)
-    email == someone&.email
+    someone.present? && email == someone&.email
   end
 
   def file_url

spec/models/commentaire_spec.rb

@@ -40,6 +40,12 @@ describe Commentaire do
     end
   end
 
+  describe "sent_by?" do
+    let(:commentaire) { build(:commentaire, instructeur: build(:instructeur)) }
+    subject { commentaire.sent_by?(nil) }
+    it { is_expected.to be_falsy }
+  end
+
   describe "#redacted_email" do
     subject { commentaire.redacted_email }