Dataviews: Filter icon is displayed even when no filter capabilities are given to any field

[imrraaj]

What?

This fix hides the dropdown button when there are no filter option available to choose from

Why?

Fixes #64631

How?

Added a check if filters are available, if not then return null

Testing Instructions

1. Clone the repo
2. Edit packages/dataviews/src/components/dataviews/stories/fixtures.js and comment on any elements or filterBy properties passed in the items passed to the fields props

{
		label: 'Type',
		id: 'type',
		enableHiding: false,
		// elements: [
		// 	{ value: 'Not a planet', label: 'Not a planet' },
		// 	{ value: 'Ice giant', label: 'Ice giant' },
		// 	{ value: 'Terrestrial', label: 'Terrestrial' },
		// 	{ value: 'Gas giant', label: 'Gas giant' },
		// ],
},

{
		label: 'Categories',
		id: 'categories',
		// elements: [
		// 	{ value: 'Space', label: 'Space' },
		// 	{ value: 'NASA', label: 'NASA' },
		// 	{ value: 'Planet', label: 'Planet' },
		// 	{ value: 'Solar system', label: 'Solar system' },
		// 	{ value: 'Ice giant', label: 'Ice giant' },
		// ],
		// filterBy: {
		// 	operators: [ 'isAny', 'isNone', 'isAll', 'isNotAll' ],
		// },
		getValue: ( { item } ) => {
			return item.categories;
		},
		render: ( { item } ) => {
			return item.categories.join( ',' );
		},
		enableSorting: false,
},

3. Run npm run storybook:dev
4. Go to /?path=/story/dataviews-dataviews--default and check how the filter icon no longer appears

Testing Instructions for Keyboard

Screenshots or screencast

The dropdown button is no longer visible when there are no filter options

[github-actions]

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Unlinked contributors: raj.patel@rtcamp.com.

Co-authored-by: oandregal <oandregal@git.wordpress.org>
Co-authored-by: imrraaj <imrraaj@git.wordpress.org>
Co-authored-by: juanmaguitar <juanmaguitar@git.wordpress.org>

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[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @imrraaj! In case you missed it, we'd love to have you join us in our Slack community.

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[oandregal]

Thanks for your contribution, @imrraaj!