examples/send_message: error output fix
examples/send_message: error output fix

xmppjs/xmpp.js,stliu/node-xmpp,node-xmpp/node-xmpp,tempbottle/node-xmpp,qbit/node-xmpp,agebrock/node-xmpp,ggozad/node-xmpp,eelcocramer/node-xmpp,bentaber/ltx,samuelagm/ltx,fritx/ltx,swissmanu/ltx,fritx/ltx,ggozad/node-xmpp,node-xmpp/node-xmpp,WeBest/node-xmpp,agebrock/node-xmpp,xmppjs/xmpp.js,node-xmpp/ltx,qbit/node-xmpp