Fix inverted condition

src/tokenizer.cxx

@@ -79,7 +79,7 @@ tokenizer::operator()(std::string const & input) const {
   // Additionally, we do not want to include the final element if there is
   // actually no data remaining in the buffer/input string, even when we permit
   // empty tokens in our output.
-  if (rval.size() < max_outputs_ && buffer.empty() && from == input.size()) {
+  if (rval.size() < max_outputs_ && !(buffer.empty() && from == input.size())) {
     rval.emplace_back(buffer.empty() ? input.substr(from) : buffer);
   }
   return rval;