judge: bug fix

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.22.8",
+    "version": "2.22.9",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",

packages/hydrojudge/src/hosts/hydro.ts

@@ -141,7 +141,7 @@ class JudgeTask {
         log.debug('Next: %d %o', data);
         data.key = 'next';
         data.rid = new ObjectID(this.rid);
-        if (data.case) data.case.message = removeNixPath(data.case.message || '');
+        if (data.case) data.case.message ||= '';
         if (typeof data.message === 'string') data.message = removeNixPath(data.message);
         if (typeof data.compilerText === 'string') data.compilerText = removeNixPath(data.compilerText);
         this.ws.send(JSON.stringify(data));