deform-effect: Check against NULL pointers
deform-effect: Check against NULL pointers

Do not try to disconnect signal handlers from NULL pointers.

djdeath/clutter-multithreaded,collects/clutter,djdeath/clutter,jigpu/clutter,kerrickstaley/clutter-vala,djdeath/clutter-multithreaded,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,jigpu/clutter,ebassi/clutter,heysion/clutter-clone,djdeath/clutter-android,kerrickstaley/clutter-vala,heysion/clutter-clone,djdeath/clutter-android,djdeath/clutter-multithreaded,ebassi/clutter,collects/clutter,ebassi/clutter,collects/clutter,ebassi/clutter,djdeath/clutter,djdeath/clutter-android,jigpu/clutter,heysion/clutter-clone,GNOME/clutter,djdeath/clutter,djdeath/clutter-multithreaded,djdeath/clutter-android,djdeath/clutter,djdeath/clutter,GNOME/clutter,ebassi/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,djdeath/clutter-android,djdeath/clutter,Distrotech/clutter,Distrotech/clutter,heysion/clutter-clone,kerrickstaley/clutter-vala,GNOME/clutter,kerrickstaley/clutter-vala,jigpu/clutter,collects/clutter,collects/clutter,jigpu/clutter,jigpu/clutter,heysion/clutter-clone