What I'm seeing here:
- the problem appears when cleanupTestCase() tries to destroy the components
- cleanupTestCase() destroys Tabs
- TabBar is somehow destroyed before its style.
- tabsModel in TabBarStyle becomes null because styledItem becomes null
- isVisible() in TabBarStyle tries  to access tabsModel.count and that triggers 
the error.

Adding 
"if (!tabsModel) return false"
is enough to fix the test, although I'm not sure that's the way we want to go. 
We should investigate why that wasn't needed before Qt5.6 and why, for 
instance, the "selected" property binding (which still relies on 
tabsModel.count) does not fire any error.

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https://bugs.launchpad.net/bugs/1622577

Title:
  tst_pagestack_deprecated_toolbar unit test warnings with qt56

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