AVRO-3790 Provide namespace on UnknownSchemaError raise #2409
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What is the purpose of the change
If an UnknownSchemaError is raised for a nested type that should inherit its parent namespace, the default_namespace information is lost when rescuing this exception.
This prevents users of the library to use the raised exception to load the missing schema that may be defined in a separate file fore readability when handling large schema files.
Verifying this change
This is a simple addition of information when raising an exception on encountering an unknown schema reference. The existing unit test has been updated to make sure the correct information is added to the exception.
Documentation