Rubocop: Fix Lint/SafeNavigationWithEmpty offenses

[DemetrisChr]

lib/couchbase/json_transcoder.rb:38:31: W: [Correctable] Lint/SafeNavigationWithEmpty: Avoid calling empty? with the safe navigation operator in conditionals.
      JSON.parse(blob) unless blob&.empty?
                              ^^^^^^^^^^^^
lib/couchbase/options.rb:119:16: W: [Correctable] Lint/SafeNavigationWithEmpty: Avoid calling empty? with the safe navigation operator in conditionals.
        unless @projections&.empty?
               ^^^^^^^^^^^^^^^^^^^^

[Copilot]

Pull request overview

This pull request addresses RuboCop Lint/SafeNavigationWithEmpty offenses by removing &.empty? checks in conditionals, while preserving the intended behavior of options serialization and JSON transcoding. It also adds explicit test coverage for encoding/decoding JSON null.

Changes:

• Replace &.empty? conditional checks in Options::Get with explicit nil/empty? guards.
• Replace blob&.empty? check in JsonTranscoder#decode with a non-safe-navigation equivalent.
• Add tests asserting nil encodes to "null" and "null" decodes to nil.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
test/json_transcoder_test.rb	Adds coverage for encoding nil and decoding JSON null.
lib/couchbase/options.rb	Fixes projections-related conditional logic without safe-navigation empty? usage.
lib/couchbase/json_transcoder.rb	Updates decode guard to avoid safe-navigation empty? in conditionals.

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