message: Throw exception if curl_easy_init returns Null
diff: @@ -1094,6 +1094,12 @@ std::unique_ptr<CurlNetworkConnection> CurlConnectionPool::GetCurlConnection(
  // Creating a new connection is thread safe. No need to lock mutex here.
  // No available connection for the pool for the required host. Create one
  CURL* newHandle = curl_easy_init();
  + if (!newHandle)
  + {
  + throw Azure::Core::Http::TransportException(
  + Details::c_DefaultFailedToGetNewConnectionTemplate + host + ". "
  + + std::string("curl_easy_init returned Null"));
  + }
  CURLcode result;
  // Libcurl setup before open connection (url, connect_only, timeout)
  