refactor for more abstract validation handling in new project Vue

component

templates/fragments/edit_project_form.html

@@ -42,12 +42,15 @@
       </div>
     </div>
 
-    <div v-if="showMissingError">
+    <div v-if="errors.showMissingError">
       {{ Alert("Provide at least one environment name.", level="error") }}
     </div>
-    <div v-if="showUniqueError">
+    <div v-if="errors.showUniqueError">
       {{ Alert("Environment names must be unique.", level="error") }}
     </div>
+    <div v-if="errors.showEmptyError">
+      {{ Alert("Environment names cannot be empty.", level="error") }}
+    </div>
 
       <div class="block-list project-list-item">
         <header class="block-list__header block-list__header--grow">