[Glitch] Fix emoji picker not rendering when no custom emojis

Port 00c2089e81ebdd4a94612f1bed7d143fc2772bb3 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/emoji/picker.ts

@@ -29,7 +29,8 @@ export async function fetchCustomEmojiData() {
   const { loadAllCustomEmoji } = await import('./database');
   const emojisRaw = await loadAllCustomEmoji();
   if (emojisRaw.length === 0) {
-    return [];
+    customEmojis = [];
+    return customEmojis;
   }
 
   const categories = new Set(['custom']);