Update the feature condtions

Checking for feature t=before the permission

android/java/org/chromium/chrome/browser/notifications/BraveNotificationWarningDialog.java

@@ -91,13 +91,13 @@ public class BraveNotificationWarningDialog extends BraveDialogFragment {
     }
 
     public static boolean shouldShowRewardWarningDialog(Context context) {
-        return BravePermissionUtils.isBraveAdsNotificationPermissionBlocked(context)
-                && isBraveRewardsEnabled();
+        return isBraveRewardsEnabled()
+                && BravePermissionUtils.isBraveAdsNotificationPermissionBlocked(context);
     }
 
     public static boolean shouldShowPrivacyWarningDialog(Context context) {
-        return BravePermissionUtils.isGeneralNotificationPermissionBlocked(context)
-                && isPrivacyReportsEnabled();
+        return isPrivacyReportsEnabled()
+                && BravePermissionUtils.isGeneralNotificationPermissionBlocked(context);
     }
 
     private static boolean shouldShowBothWarningDialog(Context context) {

android/java/org/chromium/chrome/browser/notifications/BravePermissionUtils.java

@@ -62,7 +62,7 @@ public class BravePermissionUtils {
                     (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
             NotificationChannelGroup notificationChannelGroup =
                     notificationManager.getNotificationChannelGroup(channelGroupName);
-            return notificationChannelGroup.isBlocked();
+            return notificationChannelGroup != null ? notificationChannelGroup.isBlocked() : false;
         } else {
             return NotificationManagerCompat.from(context).areNotificationsEnabled();
         }