Fixed check for drawable to work properly for context views as well (not
  just render views). Fixing logic added by commits c2360275 and
c8736fa3. vtkSMViewProxy should not have code that works with
vtkPVRenderView alone. This fixes LoadStateMultiView test issues on OsX.

Change-Id: I8ef899cb47fafae75fa57ef0a603c7a12e48e00e