Check timeKeeper pointer nullity before use.

Francois Mazenrequested to merge
francois.mazen/paraview:fix_pvbatch_ConnectToCatalyst_crash into master

Closes #21727 (closed)

Backport: release

The timeKeeper pointer was not checked before use. It triggered a crash when calling ConnectToCatalyst before GetRenderView in pvpython.

Python test added.

Edited by Francois Mazen

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