don't clean the rna champ value

Cleaning the value is useless, when fetching the association,
as the value will be re-written by the dossier update, when the user
fills in the dossier.

Furthermore we need the value to persist when prefilling the champ.

app/models/concerns/rna_champ_association_fetchable_concern.rb

@@ -6,7 +6,9 @@ module RNAChampAssociationFetchableConcern
     update!(data: data, value: rna)
     nil
   rescue APIEntreprise::API::Error, ActiveRecord::RecordInvalid => error
-    update(data: nil, value: nil)
+    self.data = nil
+    self.value = rna
+    save(validate: false)
     if error.try(:network_error?) && !APIEntrepriseService.api_up?
       :network_error
     else

spec/controllers/champs/rna_controller_spec.rb

@@ -37,10 +37,8 @@ describe Champs::RNAController, type: :controller do
 
         subject! { get :show, params: params, format: :turbo_stream }
 
-        it 'clears the data and value on the model' do
-          champ.reload
-          expect(champ.data).to eq({})
-          expect(champ.value).to eq("")
+        it 'clears the data on the model' do
+          expect(champ.reload.data).to eq({})
         end
 
         it 'clears any information or error message' do
@@ -55,10 +53,8 @@ describe Champs::RNAController, type: :controller do
 
         subject! { get :show, params: params, format: :turbo_stream }
 
-        it 'clears the data and value on the model' do
-          champ.reload
-          expect(champ.data).to be_nil
-          expect(champ.value).to be_nil
+        it 'clears the data on the model' do
+          expect(champ.reload.data).to be_nil
         end
 
         it 'displays a “RNA is invalid” error message' do
@@ -94,10 +90,8 @@ describe Champs::RNAController, type: :controller do
 
         subject! { get :show, params: params, format: :turbo_stream }
 
-        it 'clears the data and value on the model' do
-          champ.reload
-          expect(champ.data).to be_nil
-          expect(champ.value).to be_nil
+        it 'clears the data on the model' do
+          expect(champ.reload.data).to be_nil
         end
 
         it 'displays a “API is unavailable” error message' do

spec/models/concern/rna_champ_association_fetchable_concern_spec.rb

@@ -10,10 +10,10 @@ RSpec.describe RNAChampAssociationFetchableConcern do
 
     subject(:fetch_association!) { champ.fetch_association!(rna) }
 
-    shared_examples "an association fetcher" do |expected_result, expected_value, expected_data|
+    shared_examples "an association fetcher" do |expected_result, _expected_value, expected_data|
       it { expect(fetch_association!).to eq(expected_result) }
 
-      it { expect { fetch_association! }.to change { champ.reload.value }.to(expected_value) }
+      it { expect { fetch_association! }.to change { champ.reload.value }.to(rna) }
 
       it { expect { fetch_association! }.to change { champ.reload.data }.to(expected_data) }
     end
@@ -31,7 +31,7 @@ RSpec.describe RNAChampAssociationFetchableConcern do
       let(:status) { 422 }
       let(:body) { '' }
 
-      it_behaves_like "an association fetcher", nil, nil, nil
+      it_behaves_like "an association fetcher", nil, '1234', nil
     end
 
     context 'when the RNA is unknow' do
@@ -49,7 +49,7 @@ RSpec.describe RNAChampAssociationFetchableConcern do
 
       before { expect(APIEntrepriseService).to receive(:api_up?).and_return(false) }
 
-      it_behaves_like "an association fetcher", :network_error, nil, nil
+      it_behaves_like "an association fetcher", :network_error, 'W595001988', nil
     end
 
     context 'when the RNA informations are retrieved successfully' do