fix(autocomplete-js): avoid warning when renderer is not specified at all

[sarahdayan]

The renderer.render warning should only show up when providing the render option and not poviding renderer.render, but not when render isn't specified at all.

This fix ensures the warning doesn't show up when you're only providing render without specifying renderer at all.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit f66a990:

Sandbox	Source
algolia/autocomplete	Configuration
@algolia/autocomplete-example-instantsearch	Configuration
@algolia/autocomplete-example-playground	Configuration
@algolia/autocomplete-example-preview-panel-in-modal	Configuration
@algolia/autocomplete-example-react-renderer	Configuration
algolia/autocomplete	Configuration
@algolia/autocomplete-example-starter	Configuration
@algolia/autocomplete-example-reshape	Configuration
@algolia/autocomplete-example-vue	Configuration

[FabienMotte]

✨