docs don't work in multilingual mode

[romankurnovskii]

To Reproduce

1. turn o multilingual mode in languages.yaml
2. add 2nd language post in docs

• content
  • docs
    • mychapter
      • index.md
      • index.zh.md

ERROR 2022/06/30 07:35:49 render of "page" failed: "/Users/user/Desktop/del/hugo-eureka/layouts/docs/single.html:2:3": execute of template failed: template: docs/single.html:2:3: executing "main" at <partial "components/doc-layout" .>: error calling partial: "/Users/user/Desktop/del/hugo-eureka/layouts/partials/components/doc-layout.html:56:55": execute of template failed: template: partials/components/doc-layout.html:56:55: executing "doc-sidebar" at <.context.Parent.Layout>: nil pointer evaluating page.Page.Layout
Error: Error building site: failed to render pages: render of "section" failed: "/Users/user/Desktop/del/hugo-eureka/layouts/docs/list.html:2:3": execute of template failed: template: docs/list.html:2:3: executing "main" at <partial "components/doc-layout" .>: error calling partial: "/Users/user/Desktop/del/hugo-eureka/layouts/partials/components/doc-layout.html:56:55": execute of template failed: template: partials/components/doc-layout.html:56:55: executing "doc-sidebar" at <.context.Parent.Layout>: nil pointer evaluating page.Page.Layout

for post works

• Hugo Version: latest
• Eureka Version: latest

[wangchucheng]

Please follow the docs or refer to examples in exampleSite folder and it will work.