H20,quit houdini while bookmark pannel is open would crash houdini

[windwolfx23]

it happens only when you try to quit houdini, while the bookmark pannel is open, it won't cause any damage though, but when network rendering using deadline, it would cause the frame task fail , even the rendering has finished and saved successfully, not every frame, for my old machines, arond 1/30 frames would have to render multiple times, giving you "fragment failure" error which is hard to track.

[windwolfx23]

after some test,I found it does not happen all the time, after I cleared all bookmarks, create new ones, the problem has gone.