prevent error on featureType undefined

src/components/Feature/Detail/FeatureHeader.vue

@@ -105,7 +105,7 @@
                 :to="{
                   name: 'ajouter-signalement',
                   params: {
-                    slug_type_signal: $route.params.slug_type_signal || featureType.slug,
+                    slug_type_signal: $route.params.slug_type_signal || featureType ? featureType.slug : '',
                   },
                 }"
                 class="ui button button-hover-green tiny-margin"
@@ -125,7 +125,7 @@
                   name: 'editer-signalement',
                   params: {
                     slug_signal: slugSignal,
-                    slug_type_signal: $route.params.slug_type_signal || featureType.slug,
+                    slug_type_signal: $route.params.slug_type_signal || featureType ? featureType.slug : '',
                   },
                   query: $route.query
                 }"