fix(champ): do not reset data on champs without fetch_external_data

app/components/editable_champ/address_component/address_component.html.haml

@@ -1,3 +1,3 @@
 = render Dsfr::ComboboxComponent.new form: @form, url: data_sources_data_source_adresse_path, selected: @champ.value, allows_custom_value: true, input_html_options: { name: :value, id: @champ.input_id, class: 'fr-select', describedby: @champ.describedby_id } do
   = @form.hidden_field :external_id, data: { value_slot: 'value' }
-  = @form.hidden_field :feature, data: { value_slot: 'data' }
+  = @form.hidden_field :feature, value: '', data: { value_slot: 'data' }

app/javascript/shared/combobox-ui.ts

@@ -44,6 +44,8 @@ export class ComboboxUI implements EventListenerObject {
   #allowsCustomValue: boolean;
   #limit?: number;
 
+  #selectedData: Option['data'] = null;
+
   constructor({
     input,
     selectedValueInput,
@@ -293,7 +295,8 @@ export class ComboboxUI implements EventListenerObject {
   private dispatchChange(cb: () => Option['data']): void {
     const value = this.#selectedValueInput.value;
     const data = cb();
-    if (value != this.#selectedValueInput.value) {
+    if (value != this.#selectedValueInput.value || data != this.#selectedData) {
+      this.#selectedData = data;
       for (const input of this.#valueSlots) {
         switch (input.dataset.valueSlot) {
           case 'value':

app/models/champ.rb

@@ -282,7 +282,7 @@ class Champ < ApplicationRecord
   end
 
   def cleanup_if_empty
-    if persisted? && external_id_changed?
+    if fetch_external_data? && persisted? && external_id_changed?
       self.data = nil
     end
   end

app/models/champs/address_champ.rb

@@ -3,10 +3,6 @@ class Champs::AddressChamp < Champs::TextChamp
     data.present?
   end
 
-  def feature
-    ''
-  end
-
   def feature=(value)
     return if value.blank?
     feature = JSON.parse(value)