Fix crash when accessing NMSSHSession channel property
Fix crash when accessing NMSSHSession channel property

AriX/NMSSH,clemensg/NMSSH,doo/NMSSH,doo/NMSSH,ADGrant/NMSSH,eugenehp/NMSSH,mralexgray/NMSSH,Lakhman/NMSSH,clemensg/NMSSH,3drobotics/NMSSH,AriX/NMSSH,ADGrant/NMSSH,doo/NMSSH,Lejdborg/NMSSH,Lejdborg/NMSSH,tbartelmess/NMSSH,eugenehp/NMSSH,Lejdborg/NMSSH,endSly/NMSSH,mralexgray/NMSSH,Lejdborg/NMSSH,tbartelmess/NMSSH,ADGrant/NMSSH,mralexgray/NMSSH,3drobotics/NMSSH,Lakhman/NMSSH,gnachman/NMSSH,gnachman/NMSSH,eugenehp/NMSSH,ricobeck/NMSSH,gnachman/NMSSH,endSly/NMSSH,endSly/NMSSH,Lakhman/NMSSH,eugenehp/NMSSH,ricobeck/NMSSH,doo/NMSSH,AriX/NMSSH,Lakhman/NMSSH,tbartelmess/NMSSH,mralexgray/NMSSH,NMSSH/NMSSH,NMSSH/NMSSH,gnachman/NMSSH,clemensg/NMSSH,NMSSH/NMSSH,AriX/NMSSH,ricobeck/NMSSH,clemensg/NMSSH,tbartelmess/NMSSH,3drobotics/NMSSH