judge: 优化找不到数据时的错误信息

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.1.20",
+    "version": "2.1.21",
     "main": "package.json",
     "author": "masnn",
     "repository": "https://github.com/hydro-dev/Hydro.git",
@@ -15,7 +15,7 @@
         "p-queue": "^6.6.1",
         "shell-quote": "^1.7.2",
         "supports-color": "^7.2.0",
-        "systeminformation": "^4.28.1",
+        "systeminformation": "^4.29.1",
         "yargs": "^16.1.0"
     },
     "peerDependencies": {

packages/hydrojudge/src/service.ts

@@ -208,7 +208,7 @@ async function postInit() {
                 this.domainId = this.request.domainId;
                 this.lang = this.request.lang;
                 this.code = this.request.code;
-                this.data = this.request.data.toString();
+                this.data = (this.request.data || '').toString();
                 this.config = this.request.config;
                 this.next = getNext(this);
                 this.end = getEnd(this.domainId, this.rid);