Fixed writeTo() of invalid and undefined value
Fixed writeTo() of invalid and undefined value

tirumalavan/ArduinoJson,AndreyAyres/ArduinoJson,naveensuryakumar/json,weera00/ArduinoJson,ELZo3/ArduinoJson,janelia-arduino/ArduinoJson,firepick1/ArduinoJson,CanTireInnovations/ArduinoJson,naveensuryakumar/json,lono-devices/ArduinoJson,hemantsangwan/Arduino-Json,0ddie/ArduinoJson,alyf80/ArduinoJson,janelia-arduino/ArduinoJson,tirumalavan/ArduinoJson,PeeJay/ArduinoJson,fayvlad/ArduinoJson,naveensuryakumar/json,CanTireInnovations/ArduinoJson,PeeJay/ArduinoJson,alyf80/ArduinoJson,ELZo3/ArduinoJson,venkatarajasekhar/ArduinoJson,lono-devices/ArduinoJson,tirumalavan/ArduinoJson,AndreyAyres/ArduinoJson,bblanchon/ArduinoJson,venkatarajasekhar/ArduinoJson,CanTireInnovations/ArduinoJson,chuz/ArduinoJson,venusdharan/ArduinoJson,weera00/ArduinoJson,spotman/ArduinoJson,hemantsangwan/Arduino-Json,bblanchon/ArduinoJson,firepick1/ArduinoJson,peterpolidoro/ArduinoJson,venusdharan/ArduinoJson,hemantsangwan/Arduino-Json,firepick1/ArduinoJson,janelia-arduino/ArduinoJson,weera00/ArduinoJson,lono-devices/ArduinoJson,fayvlad/ArduinoJson,venkatarajasekhar/ArduinoJson,janelia-arduino/ArduinoJson,ELZo3/ArduinoJson,spotman/ArduinoJson,alyf80/ArduinoJson,bblanchon/ArduinoJson,AndreyAyres/ArduinoJson,peterpolidoro/ArduinoJson,chuz/ArduinoJson,peterpolidoro/ArduinoJson,peterpolidoro/ArduinoJson,fayvlad/ArduinoJson,hassanabidpk/ArduinoJson,hassanabidpk/ArduinoJson,venusdharan/ArduinoJson,spotman/ArduinoJson,PeeJay/ArduinoJson,hassanabidpk/ArduinoJson,0ddie/ArduinoJson,chuz/ArduinoJson