Intermittent clipping plane crash

[lilleyse]

Possibly a case where getClippingFunction is called before ClippingPlaneCollection is updated?

@likangning93 would you be able to look into this?

Reported on the forum: https://groups.google.com/forum/#!topic/cesium-dev/mJ8NDsFrIhY

[likangning93]

heheh having getClippingFunction check a possibly unintialized texture was... not a good idea, my bad.
I think we can get around it though.

[likangning93]

Herm having trouble reproducing this crash though, and it does seem kind of strange because getClippingFunction shouldn't be getting called until the clipping plane collection has already been updated. But regardless...

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/forum/#!topic/cesium-dev/mJ8NDsFrIhY

If this issue affects any of these threads, please post a comment like the following:

The issue at #6566 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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