message: Normalize: Return lower cased string in error case
diff: @@ -379,12 +379,16 @@ std::string ReaderUtil::Recode(const std::string& str_to_encode,
  std::string ReaderUtil::Normalize(const std::string &str) {
  #ifdef LCF_SUPPORT_ICU
  - icu::UnicodeString& uni = icu::UnicodeString(str.c_str()).toLower();
  + icu::UnicodeString uni = icu::UnicodeString(str.c_str()).toLower();
  UErrorCode err = U_ZERO_ERROR;
  + std::string res;
  const icu::Normalizer2* norm = icu::Normalizer2::getNFKCInstance(err);
  icu::UnicodeString f = norm->normalize(uni, err);
  - std::string res;
  + if (U_FAILURE(err)) {
  + uni.toUTF8String(res);
  + } else {
  f.toUTF8String(res);
  + }
  return res;
  #else
  std::string result = str;
  