Collection: Fix an infinite loop when encountering a NULL parent
Collection: Fix an infinite loop when encountering a NULL parent

GNOME/at-spi2-core,GNOME/at-spi2-core,Distrotech/at-spi2-atk,GNOME/at-spi2-core,GNOME/at-spi2-atk,Distrotech/at-spi2-atk