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[tests][vtk][#flyspray/FS#1652] Complain about missing python vtk only once.

Jö Fahlke requested to merge feature/fs1562-make-vtktest-less-noisy into master

The test function checkVTKFile() would check once whether the python vtk module was available and cache the result of the check for later invocations. However, it would still print the warning about missing python vtk on every invocation. Change it to print the warning only once.

Also add a comment that explains that the check is indeed only done once, for the weary programmer who isn't closely familiar with the semantics of initializing static variables.

Fixes flyspray/FS#1652 (closed).

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