Fix for Newline in Headers when extraHeaders is Empty [577] (#578)
Fix for Newline in Headers when extraHeaders is Empty [577] (#578)

Closes https://github.com/Links2004/arduinoWebSockets/issues/577
Links2004/arduinoWebSockets,Links2004/arduinoWebSockets,Links2004/arduinoWebSockets,Links2004/arduinoWebSockets,Links2004/arduinoWebSockets,Links2004/arduinoWebSockets