PythonCatalyst: fix check for paraview in test

At this point, the paraview target doesn't exist, so we can't check for
it.

Change-Id: I539cb71b75da12ea8919a5a440402a0d227a21ab
Merge topic 'coprocessing-test' into next

1ad356a8 PythonCatalyst: fix check for paraview in test