Rollup merge of #107471 - notriddle:notriddle/default-settings, r=GuillaumeGomez

rustdoc: do not include empty default-settings tag in HTML

diff --combined src/librustdoc/html/templates/page.html
index 8540ee6631934c7d163644fd17e52553b9f5b1a2,0b49234e9dffef7df6a248fd97b37912138c59bd..7690d8f251f7485a04affbcb445b9b6ca7486687
--- 1/src/librustdoc/html/templates/page.html
--- 2/src/librustdoc/html/templates/page.html
+++ b/src/librustdoc/html/templates/page.html
@@@ -5,6 -5,7 +5,6 @@@
      <meta name="viewport" content="width=device-width, initial-scale=1.0"> {#- -#}
      <meta name="generator" content="rustdoc"> {#- -#}
      <meta name="description" content="{{page.description}}"> {#- -#}
 -    <meta name="keywords" content="{{page.keywords}}"> {#- -#}
      <title>{{page.title}}</title> {#- -#}
      <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.source_serif_4_regular}}"> {#- -#}
      <link rel="preload" as="font" type="font/woff2" crossorigin href="{{static_root_path|safe}}{{files.fira_sans_regular}}"> {#- -#}
@@@ -23,11 -24,13 +23,13 @@@
      {%- for theme in themes -%}
          <link rel="stylesheet" disabled href="{{page.root_path|safe}}{{theme}}{{page.resource_suffix}}.css"> {#- -#}
      {%- endfor -%}
+     {%- if !layout.default_settings.is_empty() -%}
      <script id="default-settings" {# -#}
        {% for (k, v) in layout.default_settings %}
          data-{{k}}="{{v}}"
        {%- endfor -%}
      ></script> {#- -#}
+     {%- endif -%}
      <script src="{{static_root_path|safe}}{{files.storage_js}}"></script> {#- -#}
      {%- if page.css_class.contains("crate") -%}
      <script defer src="{{page.root_path|safe}}crates{{page.resource_suffix}}.js"></script> {#- -#}