#1728 Crash after destroying ScintillaView

[Chinh Nguyen]

I just upgraded to 3.5.6 but this bug probably exists in 3.5.5 too. ListBoxImpl::ReleaseViews() can cause a crash when you destroy a ScintillaView. It's because there are ListBoxImpl class variables (table, scroller, colIcon, colText, and ds) that are uninitialized if the auto complete list isn't used because ListBoxImpl::Create() is never called. Those variables need to be initialized to NULL.

[Neil Hodgson]

Fix committed as [5fda02].