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Replace Q_ASSERT with a return if NULL

Cory Quammen requested to merge cory.quammen/paraview:15772_pick_center_crash into master

With recent changes to pqFindDataSelectionDisplayFrame, it was possible for showFrustum() to be called when the current port was NULL. This could lead to a crash when no object was selected in the pipeline browser and the "Pick Center" tool was used. Changed this code to return from this function if the view or port are NULL.

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