Handle missing notes

src/pages/Thread.module.scss

@@ -36,6 +36,21 @@
   background-color: var(--background-card);
 }
 
+.missingNote {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  p {
+    font-weight: 700;
+    font-size: 18px;
+    line-height: 34px;
+    padding-inline: 20px;
+    margin: 2px;
+    color: var(--text-secondary);
+  }
+}
+
 @media only screen and (max-width: 720px) {
   .border {
     height: 36px;

src/pages/Thread.tsx

@@ -16,7 +16,7 @@ import { sortByRecency } from '../stores/note';
 import { scrollWindowTo } from '../lib/scroll';
 import { useIntl } from '@cookbook/solid-intl';
 import Search from '../components/Search/Search';
-import { thread as t } from '../translations';
+import { placeholders as tPlaceholders, thread as t } from '../translations';
 import { userName } from '../stores/profile';
 import PageTitle from '../components/PageTitle/PageTitle';
 import NavHeader from '../components/NavHeader/NavHeader';
@@ -181,9 +181,19 @@ const Thread: Component = () => {
               }
             </For>
           </div>
-        </Show>
 
-        <Show when={primaryNote()}>
+          <Show
+            when={primaryNote()}
+            fallback={
+              <div class={styles.missingNote}>
+                <p>
+                  {intl.formatMessage(tPlaceholders.missingNote.firstLine)}
+                </p>
+                <p>
+                  {intl.formatMessage(tPlaceholders.missingNote.secondLine)}
+                </p>
+              </div>
+          }>
             <div id="primary_note">
               <NotePrimary
                 note={primaryNote() as PrimalNote}
@@ -207,6 +217,7 @@ const Thread: Component = () => {
             </For>
           </div>
         </Show>
+      </Show>
     </div>
   )
 }

src/translations.ts

@@ -992,6 +992,18 @@ export const notifications = {
 };
 
 export const placeholders = {
+  missingNote: {
+    firstLine: {
+      id: 'placeholders.missingNote.firstLine',
+      defaultMessage: 'Oups! We can\'t seem to find this note.',
+      description: 'Placeholder when the note is missing',
+    },
+    secondLine: {
+      id: 'placeholders.missingNote.secondLine',
+      defaultMessage: 'It may have been deleted by the author.',
+      description: 'Placeholder when the note is missing',
+    },
+  },
   noLikeDetails: {
     id: 'placeholders.noLikeDetails',
     defaultMessage: 'No details for likes found',