Some deferred observers get destroyed during updates #20
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Adding the changes from PR 2409 and 2412 that avoid dereferencing elements of deferredObservers_ that become null during ObservableSettings::enableUpdates(). This is discussed in PR 326 of ORE: OpenSourceRisk/Engine#326.
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Adding the changes from PR lballabio#2409 and PR lballabio#2412 that avoid dereferencing elements of
deferredObservers_that become null duringObservableSettings::enableUpdates().The change here is discussed in pull request OpenSourceRisk/Engine#326.