core: also disable smtp if smtp.user doesn't exist

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.29.5",
+    "version": "2.29.6",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/handler/user.ts

@@ -80,7 +80,7 @@ export class UserRegisterHandler extends Handler {
                 system.get('session.unsaved_expire_seconds'),
                 { mail },
             );
-            if (system.get('smtp.verify')) {
+            if (system.get('smtp.verify') && system.get('smtp.user')) {
                 const m = await this.renderHTML('user_register_mail.html', {
                     path: `register/${t[0]}`,
                     url_prefix: (this.domain.host || [])[0] || system.get('server.url'),

packages/hydrooj/src/model/task.ts

@@ -116,7 +116,7 @@ class TaskModel {
 
     static getFirst = getFirst;
 
-    static async getDelay(query?: FilterQuery<Task>) {
+    static async getDelay(query?: FilterQuery<Task>): Promise<[number, Date]> {
         const now = new Date();
         const res = await coll.findOne(query, { sort: { executeAfter: 1 } });
         if (res) return [Math.max(0, now.getTime() - res.executeAfter.getTime()), res.executeAfter];