Fixed bug where parameter length wasn't being properly checked whether it was None or not before doing length check
Fixed bug where parameter length wasn't being properly checked whether it was None or not before doing length check

pholynyk/python-xbee,sherkon18/python-xbee,blalor/python-xbee,TinajaLabs/python-xbee,vrajroham/python-xbee,epsilonorion/python-xbee,Muzer/python-xbee,khaledhassan/python-xbee,gsp8181/python-xbee,nioinnovation/python-xbee,AAGAN/python-xbee,EnerNOC/python-xbee,blalor/python-xbee,potens1/python-xbee,jhicks-camgian/python-xbee,rgardner/python-xbee,cthuun/python-xbee,markfickett/python-xbee,acrosby/python-xbee,harp00/python-xbee,sensestage/python-xbee,bkatko/python-xbee,raystubbs/python-xbee,epsilonorion/python-xbee,thom-nic/python-xbee,acrosby/python-xbee,jamesleesaunders/python-xbee,neutralio/python-xbee,lhemmen/python-xbee,ibrahimuslu/python-xbee,rtpavlovsk21/python-xbee,louietsai/python-xbee,dodo5522/python-xbee,thegooglecodearchive/python-xbee,bverdu/python-xbee,thom-nic/python-xbee,flyte/python-xbee