Implemented error checks for parsing the JSON file

src/Project-Orion/serialization.cpp

@@ -9,7 +9,17 @@ UserList loadUserList(const QString &file)
 {
     QFile doc{std::filesystem::path{file.toStdString()}};
     QString fileContents = doc.readAll();
-    QJsonDocument document = QJsonDocument::fromJson(fileContents.toUtf8());
+
+    QJsonParseError errors;
+    QJsonDocument document =
+        QJsonDocument::fromJson(fileContents.toUtf8(),
+        &errors);
+
+    if (document.isNull())
+    {
+        qDebug() << errors.errorString();
+        throw std::runtime_error{"Could not parse JSON file"};
+    }
 
     QJsonArray array = document.array();
     QVector<User> container;