Made delete wiki modal component props required and changed the component init behaviour

app/assets/javascripts/pages/projects/wikis/components/delete_wiki_modal.vue

@@ -10,17 +10,17 @@ export default {
   props: {
     deleteWikiUrl: {
       type: String,
-      required: false,
+      required: true,
       default: '',
     },
     pageTitle: {
       type: String,
-      required: false,
+      required: true,
       default: '',
     },
     csrfToken: {
       type: String,
-      required: false,
+      required: true,
       default: '',
     },
   },

app/assets/javascripts/pages/projects/wikis/index.js

@@ -14,8 +14,12 @@ document.addEventListener('DOMContentLoaded', () => {
   new ZenMode(); // eslint-disable-line no-new
   new GLForm($('.wiki-form'), true); // eslint-disable-line no-new
 
+  const deleteWikiButton = document.getElementById('delete-wiki-button');
+
+  if (deleteWikiButton) {
     Vue.use(Translate);
-  const { deleteWikiUrl, pageTitle } = document.getElementById('delete-wiki-button').dataset;
+
+    const { deleteWikiUrl, pageTitle } = deleteWikiButton.dataset;
     const deleteWikiModalEl = document.getElementById('delete-wiki-modal');
     const deleteModal = new Vue({ // eslint-disable-line
       el: deleteWikiModalEl,
@@ -32,4 +36,5 @@ document.addEventListener('DOMContentLoaded', () => {
         });
       },
     });
+  }
 });