A bunch of ParaViewWeb fix

- Fix WebGL export issue (segfault)
- Fix ContourBy array selection in UI
- Add more filter by default
- Prevent proxy.GetProperty('xxx').GetData() when 'xxx' does not exist

Change-Id: I0a73e4ae092a14bb705b6bfc0f30d3c5f233f84d
Fix Web Test to validate correct values

Change-Id: I52f3408889520a43bad350ca1881d6142b66a27e
Merge topic 'pvweb-fixes' into next

8b43eb33 Fix Web Test to validate correct values
111e2497 A bunch of ParaViewWeb fix