Ensure vtkOrderedCompositeDistributor::RequestData() returns

This fixes a bug in which when PARAVIEW_USE_MPI was not defined
the vtkOrderedCompositeDistributor::RequestData() would reach the
end of the method without returning.

Change-Id: I0bea5a225ca24f19fe15de6278a52b47944af19a
Merge topic 'fix-ordered-composite-distributor-return' into next

7a0c07b Ensure vtkOrderedCompositeDistributor::RequestData() returns