Remove unused code from Commentaire

app/models/commentaire.rb

@@ -1,6 +1,5 @@
 class Commentaire < ApplicationRecord
   belongs_to :dossier, inverse_of: :commentaires, touch: true
-  belongs_to :piece_justificative
 
   belongs_to :user
   belongs_to :gestionnaire

app/views/shared/dossiers/messages/_message.html.haml

@@ -10,12 +10,7 @@
       = commentaire_date(commentaire)
   .rich-text= sanitize(simple_format(commentaire.body))
 
-  - if commentaire.piece_justificative
-    .attachment-link
-      = link_to commentaire.piece_justificative.content_url, class: "button", target: "_blank", rel: "noopener", title: "Télécharger" do
-        %span.icon.attachment
-        = commentaire.piece_justificative.original_filename
-  - elsif commentaire.file.present?
+  - if commentaire.file.present?
     .attachment-link
       = link_to commentaire.file_url, class: "button", target: "_blank", rel: "noopener", title: "Télécharger" do
         %span.icon.attachment

spec/models/commentaire_spec.rb

@@ -7,8 +7,6 @@ describe Commentaire do
   it { is_expected.to have_db_column(:updated_at) }
   it { is_expected.to belong_to(:dossier) }
 
-  it { is_expected.to belong_to(:piece_justificative) }
-
   describe "#notify" do
     let(:procedure) { create(:procedure) }
     let(:gestionnaire) { create(:gestionnaire) }