[SD-1450] exclude empty values from aggregations

[lambry]

Issue: https://digital-vic.atlassian.net/browse/SD-1450

What I did

• Exclude empty values from aggregations

Checklist

For all PR's

• I've added relevant changes to the project Readme if needed
• I've updated the documentation site as needed
• I have added tests to cover my changes (if not applicable, please state why in a comment)

For new UI components only

• I have added a storybook story covering all variants
• I have checked a11y tab in storybook passes
• I have added cypress component tests (if the component is interactive)
• Any events are emitted on the event bus using emitRplEvent

[cypress]

ripple-framework    Run #3130

Run Properties:   Passed #3130  •  79502ab79f: fix(@dpc-sdp/ripple-tide-search): exclude empty values from aggregations

Project	ripple-framework
Branch Review	bugfix/hide-blank-aggregations
Run status	Passed #3130
Run duration	14m 37s
Commit	79502ab79f: fix(@dpc-sdp/ripple-tide-search): exclude empty values from aggregations
Committer	David Featherston
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	2
Pending	4
Skipped	0
Passing	281
View all changes introduced in this branch ↗︎