Ensure 0 is always the default for the individual exception counters in ActiveJob

Some adapters like Resque that use Redis, convert the Ruby hash with a
default value, Hash.new(0), into a regular hash without a default value
after serializing, storing and deserializing. This raises an error when
we try to access a missing exception key. A simple solution is not to
rely on the hash's default value, and provide a default as alternative
when accessing it instead.

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