refactor: api_geo_services raises if wrong dep or city code

app/services/api_geo_service.rb

@@ -126,9 +126,6 @@ class APIGeoService
       return fallback if department_code.nil? || city_code.nil?
 
       commune_name(department_code, city_code) || fallback
-
-    rescue StandardError
-      fallback
     end
 
     private

spec/services/api_geo_service_spec.rb

@@ -130,11 +130,5 @@ describe APIGeoService do
 
       it { is_expected.to eq('Paris') }
     end
-
-    context 'with a wrong department' do
-      let(:department_code) { 'wrong' }
-
-      it { is_expected.to eq('Paris') }
-    end
   end
 end