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

@@ -14,22 +14,27 @@ document.addEventListener('DOMContentLoaded', () => {
   new ZenMode(); // eslint-disable-line no-new
   new GLForm($('.wiki-form'), true); // eslint-disable-line no-new
 
-  Vue.use(Translate);
-  const { deleteWikiUrl, pageTitle } = document.getElementById('delete-wiki-button').dataset;
-  const deleteWikiModalEl = document.getElementById('delete-wiki-modal');
-  const deleteModal = new Vue({ // eslint-disable-line
-    el: deleteWikiModalEl,
-    data: {
-      deleteWikiUrl: '',
-    },
-    render(createElement) {
-      return createElement(deleteWikiModal, {
-        props: {
-          pageTitle,
-          deleteWikiUrl,
-          csrfToken: csrf.token,
-        },
-      });
-    },
-  });
+  const deleteWikiButton = document.getElementById('delete-wiki-button');
+
+  if (deleteWikiButton) {
+    Vue.use(Translate);
+
+    const { deleteWikiUrl, pageTitle } = deleteWikiButton.dataset;
+    const deleteWikiModalEl = document.getElementById('delete-wiki-modal');
+    const deleteModal = new Vue({ // eslint-disable-line
+      el: deleteWikiModalEl,
+      data: {
+        deleteWikiUrl: '',
+      },
+      render(createElement) {
+        return createElement(deleteWikiModal, {
+          props: {
+            pageTitle,
+            deleteWikiUrl,
+            csrfToken: csrf.token,
+          },
+        });
+      },
+    });
+  }
 });