Fix printing warnings for missing classes in categories file.

    # Expands class name like 'Foo.*' into multiple class names.

    def expand(name)

      re = Regexp.new("^" + name.split(/\*/, -1).map {|part| Regexp.escape(part) }.join('.*') + "$")

      @relations.to_a.find_all {|cls| re =~ cls[:name] && !cls[:private] }.map {|cls| cls[:name] }.sort

      classes = @relations.to_a.find_all {|cls| re =~ cls[:name] && !cls[:private] }.map {|cls| cls[:name] }.sort

      if classes.length == 0

        Logger.instance.warn("No class found matching a pattern '#{name}' in categories file.")

      end

      classes

    end

    # Prints warnings for missing classes in categories file

    def validate

      # Build a map of all classes listed in categories

      listed_classes = {}

      # Check that each class listed in overview file exists

      @categories.each do |cat|

        cat["groups"].each do |group|

          group["classes"].each do |cls_name|

            unless @relations[cls_name]

              Logger.instance.warn("Class '#{cls_name}' in category '#{cat['name']}/#{group['name']}' not found")

            end

            listed_classes[cls_name] = true

          end

        end

      end

      # Check that each existing non-private class is listed in overview file

      # Check that each existing non-private class is listed

      @relations.each do |cls|

        unless listed_classes[cls[:name]] || cls[:private]

          Logger.instance.warn("Class '#{cls[:name]}' not found in categories file")