Fails to build when author param is present on page

Websites cannot be built if the author param is on a page. This is a regression introduced via !334 (merged).

Logs

ERROR 2023/11/15 15:08:50 render of "page" failed: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/_default/baseof.html:16:25": execute of template failed: template: _default/single.html:16:25: executing "head" at <partial "head.html" .>: error calling partial: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/partials/head.html:35:37": execute of template failed: template: partials/head.html:35:37: executing "partials/head.html" at <.Page.Params.author>: can't evaluate field Page in type string
ERROR 2023/11/15 15:08:50 render of "page" failed: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/_default/baseof.html:16:25": execute of template failed: template: _default/single.html:16:25: executing "head" at <partial "head.html" .>: error calling partial: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/partials/head.html:35:37": execute of template failed: template: partials/head.html:35:37: executing "partials/head.html" at <.Page.Params.author>: can't evaluate field Page in type string
ERROR 2023/11/15 15:08:50 render of "page" failed: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/_default/baseof.html:16:25": execute of template failed: template: _default/single.html:16:25: executing "head" at <partial "head.html" .>: error calling partial: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/partials/head.html:35:37": execute of template failed: template: partials/head.html:35:37: executing "partials/head.html" at <.Page.Params.author>: can't evaluate field Page in type string
Error: Error building site: failed to render pages: render of "page" failed: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/_default/baseof.html:16:25": execute of template failed: template: _default/single.html:16:25: executing "head" at <partial "head.html" .>: error calling partial: "/home/jenkins/agent/workspace/lic_sparkplug.eclipse.org_MR-159/node_modules/eclipsefdn-hugo-solstice-theme/layouts/partials/head.html:35:37": execute of template failed: template: partials/head.html:35:37: executing "partials/head.html" at <.Page.Params.author>: can't evaluate field Page in type string