Add some more sanity checks to clutter_do_event()
Add some more sanity checks to clutter_do_event()

Silently ignore events on stages during destruction; but print out a
warning if clutter_do_event() is being called with a stage-less event.

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