[improve][schema]Improve the getSchema() method in SchemaRegistryServiceImpl.java

[nikam14]

Motivation

In SchemaRegistryServiceImpl.java there are two getSchema() methods.
1 - getSchema(String schemaId)
2 - getSchema(String schemaId, SchemaVersion version)
In the first method after getting Schema it is checked that whether the Schema is deleted or not. In Second method it is not checked when Schema.version=Latest .
Adding the check can improve code.

Modifications

checking Schema is deleted or not before return in getSchema() method.

Verifying this change

• Make sure that the change passes the CI checks.

This change is already covered by existing tests.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

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