fix(NavController): check if view has already been destroyed
fix(NavController): check if view has already been destroyed

AbraaoAlves/ionic,manucorporat/ionic,janglednerves/ionic,alan-agius4/ionic,driftyco/ionic,driftyco/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,jarrodkoch/ionic,cambronjay/ionic,brianespinosa/ionic2-sass,jarrodkoch/ionic,dennybiasiolli/ionic,jhlee8804/ionic,joshesp/ionic,joshesp/ionic,jarrodkoch/ionic,jarrodkoch/ionic,janglednerves/ionic,manucorporat/ionic,manucorporat/ionic,dennybiasiolli/ionic,alan-agius4/ionic,cambronjay/ionic,janglednerves/ionic,jhlee8804/ionic,TillaTheHun0/ionic,janglednerves/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,dennybiasiolli/ionic,driftyco/ionic,jarrodkoch/ionic,alan-agius4/ionic,alan-agius4/ionic,jhlee8804/ionic,driftyco/ionic,janglednerves/ionic,alan-agius4/ionic,dennybiasiolli/ionic,AbraaoAlves/ionic,manucorporat/ionic,driftyco/ionic,joshesp/ionic,cambronjay/ionic,TillaTheHun0/ionic,dennybiasiolli/ionic,jhlee8804/ionic,joshesp/ionic,cambronjay/ionic,cambronjay/ionic,AbraaoAlves/ionic,jhlee8804/ionic,manucorporat/ionic,alan-agius4/ionic