qt: Don't show error dialog when canceling the Load Folder dialog

Previously, when canceling out of the Load Folder dialog, a user would
get an error dialog about the selected folder not containing a main
file, however, by canceling out of the dialog, no selection was actually
made.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/yuzu/main.cpp b/src/yuzu/main.cpp
index e28679cd1..bb7f93a8c 100644
--- a/src/yuzu/main.cpp
+++ b/src/yuzu/main.cpp
@@ -631,9 +631,15 @@ void GMainWindow::OnMenuLoadFile() {
 }
 
 void GMainWindow::OnMenuLoadFolder() {
-    QDir dir = QFileDialog::getExistingDirectory(this, tr("Open Extracted ROM Directory"));
+    const QString dir_path =
+        QFileDialog::getExistingDirectory(this, tr("Open Extracted ROM Directory"));
 
-    QStringList matching_main = dir.entryList(QStringList("main"), QDir::Files);
+    if (dir_path.isNull()) {
+        return;
+    }
+
+    const QDir dir{dir_path};
+    const QStringList matching_main = dir.entryList(QStringList("main"), QDir::Files);
     if (matching_main.size() == 1) {
         BootGame(dir.path() + DIR_SEP + matching_main[0]);
     } else {