fix(dossier): improuve commune champ rendering in pdf

app/models/champs/commune_champ.rb

@@ -25,7 +25,7 @@ class Champs::CommuneChamp < Champs::TextChamp
   before_validation :on_code_postal_change
 
   def for_export
-    [name, code, departement? ? departement_code_and_name : '']
+    [name, code? ? code : '', departement? ? departement_code_and_name : '']
   end
 
   def departement_name

app/views/dossiers/show.pdf.prawn

@@ -170,14 +170,14 @@ def add_single_champ(pdf, champ)
       add_identite_etablissement(pdf, champ.etablissement)
     end
   when 'Champs::NumberChamp'
-    value = champ.to_s.empty? ? 'Non communiqué' : number_with_delimiter(champ.to_s)
+    value = champ.blank? ? 'Non communiqué' : number_with_delimiter(champ.to_s)
     format_in_2_lines(pdf, tdc.libelle, value)
   when 'Champs::CommuneChamp'
-    value = champ.to_s.empty? ? 'Non communiqué' : champ.to_s
+    value = champ.blank? ? 'Non communiqué' : champ.to_s
     format_in_2_lines(pdf, tdc.libelle, value)
-    pdf.text "Département : #{champ.departement}" if champ.departement.present?
+    pdf.text "Département : #{champ.departement_code_and_name}" if champ.departement?
   else
-    value = champ.to_s.empty? ? 'Non communiqué' : champ.to_s
+    value = champ.blank? ? 'Non communiqué' : champ.to_s
     format_in_2_lines(pdf, tdc.libelle, value)
   end
 end

spec/controllers/instructeurs/dossiers_controller_spec.rb

@@ -738,6 +738,13 @@ describe Instructeurs::DossiersController, type: :controller do
       it { expect(assigns(:include_infos_administration)).to eq(true) }
       it { expect(assigns(:is_dossier_in_batch_operation)).to eq(false) }
       it { expect(response).to render_template 'dossiers/show' }
+
+      context 'empty champs commune' do
+        let(:procedure) { create(:procedure, :published, :with_commune, instructeurs:) }
+        let(:dossier) { create(:dossier, :accepte, procedure:) }
+
+        it { expect(response).to render_template 'dossiers/show' }
+      end
     end
 
     context 'with dossier in batch_operation' do

spec/models/dossier_spec.rb

@@ -1680,8 +1680,8 @@ describe Dossier do
           [
             [yes_no_tdc.libelle, "Oui"],
             [text_tdc.libelle, "text"],
-            ["commune", nil],
+            ["commune", ''],
-            ["commune (Code insee)", nil],
+            ["commune (Code insee)", ''],
             ["commune (Département)", ""]
           ]
         end