Fix template error due to divided by zero

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What does this MR do and why?

Fixes this error #473622 (closed)

🛠 with ❤ at Siemens

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides

Screenshots or screen recordings

No changes in the frontend. This MR just solves the template error caused by a division by zero.

Before

 ActionView::Template::Error:
       divided by 0
     # ./app/views/admin/system_info/show.html.haml:46:in `/'
     # ./app/views/admin/system_info/show.html.haml:46:in `block (3 levels) in _app_views_admin_system_info_show_html_haml__4367467700122324564_858420'

After

No template error

How to set up and validate locally

1. Execute the test

bundle exec spec/features/admin/admin_system_info_spec.rb

Related to #473622 (closed)