fix_dangling_exhaust_nodes.rb

require 'openstudio'

model = OpenStudio::Model::Model::load('broken.osm').get

zones = model.getThermalZones;

zones.each do |zone|
  puts "#{zone.nameString}"
  pl = zone.exhaustPortList
  pl_objects = pl.modelObjects
  puts "   exhaust port list size: #{pl_objects.size}"
  pl_objects.each do |exhaust_node|
    puts "       exhaust node: #{exhaust_node.nameString}"
    exhaust_node_outlet = exhaust_node.to_StraightComponent.get.outletModelObject
    if exhaust_node_outlet.empty?
      puts "           exhaust node outlet is empty"
      exhaust_node.to_HVACComponent.get.disconnect
      exhaust_node.remove
    else
      puts "           exhaust node outlet: #{exhaust_node_outlet.get.nameString}"
    end
  end
end

model.save 'fix.osm', true