judge: optional error params

packages/hydrojudge/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.19.3",
+    "version": "2.19.4",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",

packages/hydrojudge/src/cases.ts

@@ -68,7 +68,7 @@ export default async function readCases(folder: string, cfg: Record<string, any>
             result.count = Math.sum(result.subtasks.map((i) => i.cases.length));
             if (cfg.isSelfSubmission) args.next?.({ message: { message: 'Found {0} testcases.', params: [result.count] } });
         } catch (e) {
-            throw new SystemError('Cannot parse testdata.', [e.message, ...e.params]);
+            throw new SystemError('Cannot parse testdata.', [e.message, ...(e.params || [])]);
         }
     }
     result.subtasks = normalizeSubtasks(result.subtasks || [], checkFile, config.time, config.memory);