Consider :none as docs only change

danger/changelog/Dangerfile

@@ -29,8 +29,8 @@ def ce_port_changelog?(changelog_path)
   helper.ee? && !ee_changelog?(changelog_path)
 end
 
-def docs_only_change?
-  helper.changes_by_category.keys == [:docs]
+def categories_need_changelog?
+  (helper.changes_by_category.keys - %i[docs none]).any?
 end
 
 def check_changelog(path)
@@ -59,7 +59,7 @@ def sanitized_mr_title
   gitlab.mr_json["title"].gsub(/^WIP: */, '').gsub(/`/, '\\\`')
 end
 
-changelog_needed = !docs_only_change? && (gitlab.mr_labels & NO_CHANGELOG_LABELS).empty?
+changelog_needed = categories_need_changelog? && (gitlab.mr_labels & NO_CHANGELOG_LABELS).empty?
 changelog_found = git.added_files.find { |path| path =~ %r{\A(ee/)?(changelogs/unreleased)(-ee)?/} }
 
 if git.modified_files.include?("CHANGELOG.md")