Settings: Fix QrCamera crash on devices without flash

Change-Id: Ife34b5fb87a9a4f509b665a3433e0b2ba857c885
diff --git a/src/com/android/settings/wifi/qrcode/QrCamera.java b/src/com/android/settings/wifi/qrcode/QrCamera.java
index c682587..00f0348 100644
--- a/src/com/android/settings/wifi/qrcode/QrCamera.java
+++ b/src/com/android/settings/wifi/qrcode/QrCamera.java
@@ -178,7 +178,9 @@
         Size pictureSize = getBestPictureSize(mParameters);
         mParameters.setPreviewSize(pictureSize.getWidth(), pictureSize.getHeight());
 
-        if (mParameters.getSupportedFlashModes().contains(Parameters.FLASH_MODE_OFF)) {
+        final List<String> supportedFlashModes = mParameters.getSupportedFlashModes();
+        if (supportedFlashModes != null &&
+                supportedFlashModes.contains(Parameters.FLASH_MODE_OFF)) {
             mParameters.setFlashMode(Parameters.FLASH_MODE_OFF);
         }