[TIMOB-25431] Improve getActivity() validation

[garymathews]

• getActivity() must always return a valid activity. There are many instances where we assume getActivity() to return a valid activity TiUILabel#L71, TiTableView.java#L307 etc...
• Add validation to TiUICardView.getLayout()

JIRA Ticket

[sgtcoolguy]

CR looks good to me.

[jquick-axway]

CR: Pass

[drauggres]

getActivity() must always return a valid activity.

Looks like bad idea to me.

There are many instances where we assume getActivity() to return a valid activity

Probably we should check getActivity() result for null and for .isDestroyed() (smth like #9579)

[jquick-axway]

@drauggres, while I agree with you, the problem is too much code (especially modules) assumes this method never returns null and the stack-trace makes it look like a core problem on our end. This issue is already too wide spread. So, with this change, this method will grab the 1st launched splash-screen activity if no other child activity exists on the UI stack since it's guaranteed to exist.

[build]

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