Fixed a NullPointerException in AccountManagerService.

        DevicePolicyManager dpm = (DevicePolicyManager) mContext

                .getSystemService(Context.DEVICE_POLICY_SERVICE);

        String[] typesArray = dpm.getAccountTypesWithManagementDisabledAsUser(userId);

        if (typesArray == null) {

            return true;

        }

        for (String forbiddenType : typesArray) {

            if (forbiddenType.equals(accountType)) {

                return false;