JavaScript error with `--one-file`

[jacob-carlborg]

When generating documentation with the --one-file flag, the generate output contains a JavaScript error.

Steps to reproduce

1. Run the following commands:

   cat << EOF >> foo.rb
   # Foobar
   class Foo
   end
   EOF
   
   yard doc --one-file --no-save -o .
   

2. Open the generate index.html in the browser
3. Look at the browser console/JavaScript errors

Actual Output

I get this error, both in Safari and Chrome:

ReferenceError: Can't find variable: pathId
    postMessage - index.html:780

The error occurs in a JavaScript function called: navExpander. The issue is probably that the --one-file output does not have a navigation bar, but the JavaScript is shared with the default template, which do have a navigation bar.

Expected Output

No JavaScript errors.

Environment details:

• OS: macOS 12.0.1
• Ruby version (ruby -v): ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-darwin20]
• YARD version (yard -v): yard 0.9.27