core: ensure char '=' exists

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.37.7",
+    "version": "2.37.8",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/options.ts

@@ -10,7 +10,8 @@ export = function load() {
     const envFile = path.resolve(os.homedir(), '.hydro', 'env');
     if (fs.existsSync(envFile)) {
         const content = fs.readFileSync(envFile).toString().replace(/\r/g, '');
-        for (const line of content.split('\n').filter((l) => l.trim())) {
+        for (const line of content.split('\n')) {
+            if (!line.includes('=')) continue;
             process.env[line.split('=')[0]] = line.split('=')[1].trim();
         }
     }