message: core: drop unnecessary duplicate check
diff: @@ -76,13 +76,10 @@ public:
  inline
  String::String(const std::string& str)
  : cstr_(0), len_(0)
  -{
  - if (!str.empty())
  {
  size_t len = str.size();
  if (len) memcpy(allocate(len), str.c_str(), len);
  }
  -}
  inline
  String::String(const std::string& str, size_t pos, size_t len)
  @@ -99,11 +96,8 @@ inline
  String& String::operator = (const std::string& str)
  {
  deallocate();
  - if (!str.empty())
  - {
  size_t len = str.size();
  if (len) memcpy(allocate(len), str.c_str(), len);
  - }
  return *this;
  }
  