Pavel Yaskevich fca8106f95 [Diagnostics] Guard against missing parent initializer in missing unwrap diagnostic ...

While trying to diagnose missing optional unwrap for single use
vars guard against it not having a parent initializer.

Unfortunately there is no test-case for this but we have
received multiple reports about `offerDefaultValueUnwrapFixIt`
crashing trying to access locator on passed in `expr`.

Resolves: rdar://problem/51784793

2019-06-18 14:23:35 -07:00

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