fix: don't expect at least 1 channel for concat

package.json

@@ -1,7 +1,7 @@
 {
     "type": "module",
     "name": "revolt.js",
-    "version": "5.2.1-patch.1",
+    "version": "5.2.1-patch.2",
     "main": "dist/index.js",
     "repository": "https://github.com/revoltchat/revolt.js",
     "author": "Paul Makles <insrt.uk>",

src/config.ts

@@ -1,4 +1,4 @@
-export const LIBRARY_VERSION = "5.2.1-patch.1";
+export const LIBRARY_VERSION = "5.2.1-patch.2";
 
 export const defaultConfig = {
     apiURL: "https://api.revolt.chat",

src/maps/Servers.ts

@@ -63,7 +63,7 @@ export class Server {
             .filter(channel => !permit?.isMuted(channel))
             .map((channel) => channel?.mentions) as string[][];
 
-        return arr[0].concat(...arr.slice(1));
+        return ([] as string[]).concat(...arr);
     }
 
     constructor(client: Client, data: ServerI) {