fix(side-navigation): leave if no aside can be found

[trieloff]

https://aside-fix--helix-website--adobe.aem.page/docs/

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [3e5e411](https://github.com/adobe/helix-website/commit/3e5e4113b7801e00ea7ab4d1d27c6f0cc2413bef) :white_check_mark: (latest) * [10157cb](https://github.com/adobe/helix-website/commit/10157cbaefe6f5142e62e9d04b819ce59e3f8dd1) :white_check_mark: * [ef53829](https://github.com/adobe/helix-website/commit/ef53829eaa467a9543647086bb94da75bbd14557) :white_check_mark:

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/docs/