pncconf -fix a crash on new/modify page
pncconf -fix a crash on new/modify page

if you had configured the mesa page then went to the new/modify
page pncconf crashed when you went back past the mesa page do to
combobox model data changing without updating the mesa page
comboboxes

Signed-off-by: Chris Morley <663b38f0e776e9171484159033cf8a402a4c1654@hotmail.com>
Signed-off-by: cmorley <663b38f0e776e9171484159033cf8a402a4c1654@hotmail.com>

bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,bobvanderlinden/machinekit,araisrobo/machinekit,unseenlaser/linuxcnc,ArcEye/MK-Qt5,Cid427/machinekit,kinsamanka/machinekit,bobvanderlinden/machinekit,cdsteinkuehler/linuxcnc,strahlex/machinekit,Cid427/machinekit,ikcalB/linuxcnc-mirror,unseenlaser/machinekit,kinsamanka/machinekit,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,Cid427/machinekit,jaguarcat79/ILC-with-LinuxCNC,cdsteinkuehler/linuxcnc,araisrobo/machinekit,ianmcmahon/linuxcnc-mirror,ianmcmahon/linuxcnc-mirror,araisrobo/machinekit,ArcEye/machinekit-testing,Cid427/machinekit,RunningLight/machinekit,ArcEye/machinekit-testing,narogon/linuxcnc,ArcEye/MK-Qt5,EqAfrica/machinekit,cdsteinkuehler/MachineKit,EqAfrica/machinekit,RunningLight/machinekit,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,aschiffler/linuxcnc,cdsteinkuehler/MachineKit,bobvanderlinden/machinekit,cdsteinkuehler/MachineKit,cnc-club/linuxcnc,kinsamanka/machinekit,mhaberler/machinekit,bobvanderlinden/machinekit,ArcEye/MK-Qt5,ArcEye/MK-Qt5,araisrobo/machinekit,kinsamanka/machinekit,narogon/linuxcnc,unseenlaser/linuxcnc,mhaberler/machinekit,ArcEye/MK-Qt5,RunningLight/machinekit,narogon/linuxcnc,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,cdsteinkuehler/MachineKit,araisrobo/machinekit,ianmcmahon/linuxcnc-mirror,ArcEye/machinekit-testing,bobvanderlinden/machinekit,strahlex/machinekit,unseenlaser/machinekit,strahlex/machinekit,aschiffler/linuxcnc,cnc-club/linuxcnc,cnc-club/linuxcnc,strahlex/machinekit,Cid427/machinekit,RunningLight/machinekit,kinsamanka/machinekit,cnc-club/linuxcnc,araisrobo/machinekit,mhaberler/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/linuxcnc,unseenlaser/linuxcnc,RunningLight/machinekit,araisrobo/linuxcnc,ArcEye/machinekit-testing,ArcEye/machinekit-testing,araisrobo/machinekit,mhaberler/machinekit,EqAfrica/machinekit,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,kinsamanka/machinekit,Cid427/machinekit,jaguarcat79/ILC-with-LinuxCNC,cnc-club/linuxcnc,unseenlaser/machinekit,araisrobo/machinekit,ArcEye/machinekit-testing,cdsteinkuehler/MachineKit,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,EqAfrica/machinekit,EqAfrica/machinekit,araisrobo/linuxcnc,ikcalB/linuxcnc-mirror,unseenlaser/linuxcnc,RunningLight/machinekit,ikcalB/linuxcnc-mirror,aschiffler/linuxcnc,unseenlaser/machinekit,RunningLight/machinekit,ArcEye/machinekit-testing,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,narogon/linuxcnc,kinsamanka/machinekit,cdsteinkuehler/linuxcnc,strahlex/machinekit,unseenlaser/machinekit,unseenlaser/machinekit,bmwiedemann/linuxcnc-mirror,cdsteinkuehler/linuxcnc,Cid427/machinekit,bmwiedemann/linuxcnc-mirror,mhaberler/machinekit,bmwiedemann/linuxcnc-mirror,EqAfrica/machinekit,cnc-club/linuxcnc,kinsamanka/machinekit,araisrobo/linuxcnc,EqAfrica/machinekit,EqAfrica/machinekit,cnc-club/linuxcnc,cdsteinkuehler/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,bobvanderlinden/machinekit,araisrobo/linuxcnc,bmwiedemann/linuxcnc-mirror,aschiffler/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,narogon/linuxcnc,aschiffler/linuxcnc,unseenlaser/machinekit,ikcalB/linuxcnc-mirror,ianmcmahon/linuxcnc-mirror,mhaberler/machinekit,ArcEye/MK-Qt5,bobvanderlinden/machinekit,cdsteinkuehler/MachineKit,unseenlaser/machinekit,unseenlaser/linuxcnc,RunningLight/machinekit,ArcEye/MK-Qt5,strahlex/machinekit,araisrobo/linuxcnc,Cid427/machinekit,ArcEye/MK-Qt5