[BUGFIX release] Ensure Engines can boot without error. #4970
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The argument passed into
instance-initializers
is either anEmber.ApplicationInstance
instance or aEmber.EngineInstance
instance. The.application
property is only present onEmber.ApplicationInstance
's.This change adds some inline comments around the various conditionals and swaps the logic to use
instance.base
when present and avoid erroring if neither.base
or.application
is present.This mirrors the functionality changes made in #4969, but targets
release
branch.Closes #4968