Misko Hevery 7bd18fca19 refactor(core): change getPreviousOrParentTNode to return TNode|null (#38707)
This change makes `getPreviousOrParentTNode` return `TNode|null` (rather
than just `TNode`) which is more reflective of the reality. The
`getPreviousOrParentTNode` can be `null` upon entering the `LView`.

PR Close #38707
2020-09-28 16:15:59 -04:00
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