Backport #4129: schema_registry: Support default nil type in union for Avro #4133
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Cover letter
Backport #4129
For Avro, null type in a union is supported for backwards compatibility,
if it's also the default. The default value must be of the type of the
first type in the union.
This change allows that.
Fixes #4120
Fixes #4135
Release notes
Improvements