Only generate inline summary if the comment exists.

src/Generator/Generators/CodeGenerator.cs

@@ -201,6 +201,7 @@ namespace CppSharp.Generators
 
         public virtual bool VisitEnumItemDecl(Enumeration.Item item)
         {
+            if (item.Comment != null)
                 GenerateInlineSummary(item.Comment);
 
             Write(item.Name);