NTPClient::sendNTPPacket() does not check whether this->_udp->beginPacket actually began. #162
Description
https://github.com/arduino-libraries/NTPClient/blob/master/NTPClient.cpp#L200
When this->_udp->beginPacket(...) fails because of DNS lookup failure or some other reason this causes the device to panic when it tries to read the result.