fix crash if FlashModes is null

Author: Marat Talipov

visionSamples/barcode-reader/app/src/main/java/com/google/android/gms/samples/vision/barcodereader/ui/camera/CameraSource.java

@@ -785,11 +785,13 @@ private Camera createCamera() {
  mFocusMode = parameters.getFocusMode();
 
  if (mFlashMode != null) {
- if (parameters.getSupportedFlashModes().contains(
- mFlashMode)) {
- parameters.setFlashMode(mFlashMode);
- } else {
- Log.i(TAG, "Camera flash mode: " + mFlashMode + " is not supported on this device.");
+ if (parameters.getSupportedFlashModes() != null) {
+ if (parameters.getSupportedFlashModes().contains(
+ mFlashMode)) {
+ parameters.setFlashMode(mFlashMode);
+ } else {
+ Log.i(TAG, "Camera flash mode: " + mFlashMode + " is not supported on this device.");
+ }
  }
  }