fix feature attributes not displayed when null value

src/components/Feature/Detail/FeatureTable.vue

@@ -13,11 +13,13 @@
             <FeatureTypeLink :feature-type="featureType" />
           </td>
         </tr>
+        {{ currentFeature.feature_data }}
         <tr
           v-for="(field, index) in currentFeature.feature_data"
           :key="'field' + index"
         >
           <td>
+            {{ field }}
             <strong
               :class="{ required: isRequired(field) }"
             >
@@ -47,7 +49,7 @@
                 {{ field.value.join(', ') }}
               </span>
               <span v-else>
-                {{ field.value.label ? field.value.label : field.value }}
+                {{ field.value && field.value.label ? field.value.label : field.value }}
               </span>
             </strong>
           </td>