Avoid creating sections with only a heading in the HTML output

Author: d-ronnqvist

Sources/DocCHTML/MarkupRenderer+Parameters.swift

@@ -30,6 +30,8 @@ package extension MarkdownRenderer {
 
     func parameters(_ info: [SourceLanguage: [ParameterInfo]]) -> [XMLNode] {
         let info = RenderHelpers.sortedLanguageSpecificValues(info)
+        guard info.contains(where: { _, params in !params.isEmpty }) else { return [] }
+        
         let items: [XMLElement] = switch info.count {
         case 1:
             [_singleLanguageParameters(info.first!.value)] // Verified to exist above

Sources/DocCHTML/MarkupRenderer+Returns.swift

@@ -44,6 +44,8 @@ package extension MarkdownRenderer {
     }
 
     func selfReferencingSection(named sectionName: String, content: [XMLNode]) -> [XMLNode] {
+        guard !content.isEmpty else { return [] }
+        
         switch goal {
         case .richness:
             let id = urlReadableFragment(sectionName.lowercased())