Fix typo in Changelog

Fix #1331

Pages excluded from the navigation do not have a second (page-specific) stylesheet in the head. When JS is enabled, an error arises when such a page is loaded, due to `initNav()` trying to disable a non-existent stylesheet.

This PR stops JS trying to disable the second stylesheet when it doesn't exist.

Note that issue #1331 was reported in connection with optimising the build of the endoflife.date site by following [my suggestion](https://github.com/just-the-docs/just-the-docs/pull/1244#issuecomment-1660246728) in #1244, but the bug also appears on the theme website at https://just-the-docs.com/404.html.

CHANGELOG.md

@@ -19,6 +19,16 @@ Code changes to `main` that are *not* in the latest release:
 
 - N/A
 
+## Release v0.6.1
+
+Hi all, this is a small patch release that only includes one change: resolving a bug introduced in 0.6.0 that causes a JS error for pages excluded from navigation.
+
+### Bugfixes
+
+- Fixed: JS error for pages excluded from navigation by [@pdmosses] in [#1332]
+
+[#1332]: https://github.com/just-the-docs/just-the-docs/pull/1332
+
 ## Release v0.6.0
 
 Hi all, this is a minor release that introduces performance improvements for build times on large sites, correctly sets the `color-scheme` property, and fixes invalid HTML. However, it introduces some potentially-breaking *internal* changes to undocumented features of the theme.

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    just-the-docs (0.6.0)
+    just-the-docs (0.6.1)
       jekyll (>= 3.8.5)
       jekyll-include-cache
       jekyll-seo-tag (>= 2.0)

assets/js/just-the-docs.js

@@ -76,8 +76,10 @@ function initNav() {
 // The page-specific stylesheet is assumed to have index 1 in the list of stylesheets.
 
 function disableHeadStyleSheet() {
+  if (document.styleSheets[1]) {
     document.styleSheets[1].disabled = true;
   }
+}
 
 {%- if site.search_enabled != false %}
 // Site search

just-the-docs.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "just-the-docs"
-  spec.version       = "0.6.0"
+  spec.version       = "0.6.1"
   spec.authors       = ["Patrick Marsceill", "Matthew Wang"]
   spec.email         = ["patrick.marsceill@gmail.com", "matt@matthewwang.me"]