fix: author warning doesn't fail build

layouts/partials/widgets/about.html

@@ -12,7 +12,7 @@
 {{ $person_page := site.GetPage (printf "/authors/%s" $author) }}
 {{ $link := $person_page.Params.personal_homepage }}
 {{ if not $person_page }}
-  {{ errorf "Could not find an author page at `%s`. Please check the value of `author` in your About widget and create an associated author page if one does not already exist. See https://sourcethemes.com/academic/docs/page-builder/#about " $person_page_path }}
+  {{ warnf "Could not find an author page at `%s`. Please check the value of `author` in your About widget and create an associated author page if one does not already exist. See https://sourcethemes.com/academic/docs/page-builder/#about " $person_page_path }}
 {{end}}
 {{ $person := $person_page.Params }}
 {{ $avatar := ($person_page.Resources.ByType "image").GetMatch "*avatar*" }}