Development setup error: Jekyll::Converters::Scss - undefined method `to_sym' for true:TrueClass

[dellagustin-sap]

When trying to use the command jekyll serve --config _config.yml,_config_dev.yml, it will fail with the following error:

  Conversion error: Jekyll::Converters::Scss encountered an error while converting 'assets/css/atom.scss':
                    undefined method `to_sym' for true:TrueClass Did you mean? to_s
                    ------------------------------------------------
      Jekyll 4.0.0   Please append `--trace` to the `serve` command 
                     for any additional information or backtrace. 
                    ------------------------------------------------
Traceback (most recent call last):
        30: from /usr/local/bundle/bin/jekyll:23:in `<main>'
        29: from /usr/local/bundle/bin/jekyll:23:in `load'
        28: from /usr/local/bundle/gems/jekyll-4.0.0/exe/jekyll:15:in `<top (required)>'
        27: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
        26: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
        25: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
        24: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
        23: from /usr/local/bundle/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute'
        22: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/commands/serve.rb:86:in `block (2 levels) in init_with_program'
        21: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/command.rb:89:in `process_with_graceful_fail'
        20: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/command.rb:89:in `each'
        19: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/command.rb:89:in `block in process_with_graceful_fail'
        18: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/commands/build.rb:36:in `process'
        17: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/commands/build.rb:65:in `build'
        16: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/command.rb:28:in `process_site'
        15: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:76:in `process'
        14: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:202:in `render'
        13: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:515:in `render_pages'
        12: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:515:in `each'
        11: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:516:in `block in render_pages'
        10: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/site.rb:523:in `render_regenerated'
         9: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:63:in `run'
         8: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:84:in `render_document'
         7: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:100:in `convert'
         6: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:100:in `reduce'
         5: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:100:in `each'
         4: from /usr/local/bundle/gems/jekyll-4.0.0/lib/jekyll/renderer.rb:102:in `block in convert'
         3: from /usr/local/bundle/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:180:in `convert'
         2: from /usr/local/bundle/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:173:in `sass_configs'
         1: from /usr/local/bundle/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:231:in `sourcemap_required?'
/usr/local/bundle/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:224:in `sourcemap_option': undefined method `to_sym' for true:TrueClass (NoMethodError)
Did you mean?  to_s

This is a follow up of #91 , see InnerSourceCommons/innersourcecommons.org#91 (comment)
See also jekyll/jekyll-sass-converter#102 and InnerSourceCommons/innersourcecommons.org#91 (comment)

I decided not to solve that together with the implementation of #91, as this issue is not really related to docker enablement.

[dellagustin-sap]

I will fix this one, you can assign it to me.