AVFoundation: Fix crash when no video capture device

No need to configure anything if there is no video capture device.

Task-number: QTBUG-65740
Change-Id: I8de7dced14b00ab3eba560f395d7e1a4a5de1682
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

src/plugins/avfoundation/camera/avfimagecapturecontrol.mm

@@ -226,7 +226,8 @@ void AVFImageCaptureControl::cancelCapture()
 
 void AVFImageCaptureControl::updateCaptureConnection()
 {
-    if (m_cameraControl->captureMode().testFlag(QCamera::CaptureStillImage)) {
+    if (m_session->videoCaptureDevice()
+        && m_cameraControl->captureMode().testFlag(QCamera::CaptureStillImage)) {
         qDebugCamera() << Q_FUNC_INFO;
         AVCaptureSession *captureSession = m_session->captureSession();
 

src/plugins/avfoundation/camera/avfmediarecordercontrol.mm

@@ -364,6 +364,9 @@ void AVFMediaRecorderControl::handleRecordingFailed(const QString &message)
 
 void AVFMediaRecorderControl::setupSessionForCapture()
 {
+    if (!m_session->videoCaptureDevice())
+        return;
+
     //adding movie output causes high CPU usage even when while recording is not active,
     //connect it only while video capture mode is enabled.
     // Similarly, connect the Audio input only in that mode, since it's only necessary