fix(autocomplete): filter out empty collections in aria-controls

[mxschmitt]

Summary

This PR fixes an issue that the aria-controls value was filled with a reference to empty collections. We can make an assumption to skip them, since recent/favorite collections don't get rendered for 0 size collections. See algolia/docsearch#2485 for more information.

Result

Its covered with tests in algolia/docsearch#2485.

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Sandbox	Source
@algolia/autocomplete-example-github-repositories-custom-plugin	Configuration
@algolia/autocomplete-example-instantsearch	Configuration
@algolia/autocomplete-example-playground	Configuration
@algolia/autocomplete-example-preview-panel-in-modal	Configuration
@algolia/autocomplete-example-starter-algolia	Configuration
@algolia/autocomplete-example-starter	Configuration
@algolia/autocomplete-example-reshape	Configuration
@algolia/autocomplete-example-vue	Configuration

[Haroenv]

Thanks @mxschmitt, will release this soon