Qt: Fix crash when saving an override if a game isn't loaded

CHANGES

@@ -28,6 +28,7 @@ Bugfixes:
  - GBA Cheats: Fix uninitialized memory getting freed when saving
  - GBA Memory: Fix several unused I/O register read values
  - Qt: Fix patch loading
+ - Qt: Fix crash when saving an override if a game isn't loaded
 Misc:
  - All: Only update version info if needed
  - FFmpeg: Encoding cleanup

src/platform/qt/GameController.cpp

@@ -574,6 +574,7 @@ void GameController::closeGame() {
 		mCoreThreadUnpause(&m_threadContext);
 	}
 	m_patch = QString();
+	clearOverride();
 
 	QMetaObject::invokeMethod(m_audioProcessor, "pause", Qt::BlockingQueuedConnection);
 	mCoreThreadEnd(&m_threadContext);

src/platform/qt/OverrideView.cpp

@@ -5,6 +5,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "OverrideView.h"
 
+#include <QPushButton>
+
 #include "ConfigController.h"
 #include "GameController.h"
 
@@ -89,6 +91,7 @@ OverrideView::OverrideView(GameController* controller, ConfigController* config,
 
 	connect(m_ui.buttonBox, SIGNAL(accepted()), this, SLOT(saveOverride()));
 	connect(m_ui.buttonBox, SIGNAL(rejected()), this, SLOT(close()));
+	m_ui.buttonBox->button(QDialogButtonBox::Save)->setEnabled(false);
 
 	if (controller->isLoaded()) {
 		gameStarted(controller->thread());
@@ -171,6 +174,7 @@ void OverrideView::gameStarted(mCoreThread* thread) {
 	}
 
 	m_ui.tabWidget->setEnabled(false);
+	m_ui.buttonBox->button(QDialogButtonBox::Save)->setEnabled(true);
 
 	switch (thread->core->platform(thread->core)) {
 #ifdef M_CORE_GBA
@@ -221,6 +225,7 @@ void OverrideView::gameStopped() {
 	m_ui.tabWidget->setEnabled(true);
 	m_ui.savetype->setCurrentIndex(0);
 	m_ui.idleLoop->clear();
+	m_ui.buttonBox->button(QDialogButtonBox::Save)->setEnabled(false);
 
 	m_ui.mbc->setCurrentIndex(0);
 	m_ui.gbModel->setCurrentIndex(0);