Improuve champ blank check

app/models/champ.rb

@@ -95,14 +95,7 @@ class Champ < ApplicationRecord
   end
 
   def blank?
-    case type_de_champ.type_champ
-    when TypeDeChamp.type_champs.fetch(:carte)
-      geo_areas.blank? || value == '[]'
-    when TypeDeChamp.type_champs.fetch(:multiple_drop_down_list)
-      value.blank? || value == '[]'
-    else
-      value.blank?
-    end
+    value.blank?
   end
 
   def search_terms

app/models/champs/carte_champ.rb

@@ -109,6 +109,10 @@ class Champs::CarteChamp < Champ
     nil
   end
 
+  def blank?
+    geo_areas.blank?
+  end
+
   private
 
   def selection_utilisateur_legacy_geometry

app/models/champs/multiple_drop_down_list_champ.rb

@@ -62,6 +62,10 @@ class Champs::MultipleDropDownListChamp < Champ
     enabled_non_empty_options.size <= THRESHOLD_NB_OPTIONS_AS_CHECKBOX
   end
 
+  def blank?
+    selected_options.blank?
+  end
+
   private
 
   def format_before_save

app/models/champs/repetition_champ.rb

@@ -30,8 +30,8 @@ class Champs::RepetitionChamp < Champ
     end
   end
 
-  def mandatory_and_blank?
-    mandatory? && champs.empty?
+  def blank?
+    champs.empty?
   end
 
   def search_terms