input: Write a python function to convert a QIcon object to a dbus.Array using the icon_to_dbus_menu_icon function.
  assert icon_to_dbus_array(QIcon()) == dbus.Array([], signature='(iiay)')
  assert icon_to_dbus_array(QIcon('path/to/icon.png')) is not None
  assert icon_to_dbus_array(QIcon('invalid/path')) == dbus.Array([], signature='(iiay)')
output: def icon_to_dbus_array(qicon):
      from PyQt5.QtGui import QIcon
      import dbus
      from dbusmenu import icon_to_dbus_menu_icon
  
      if qicon.isNull():
          return dbus.Array([], signature='(iiay)')
  
      icon_data = icon_to_dbus_menu_icon(qicon)
      if icon_data is None:
          return dbus.Array([], signature='(iiay)')
  
      return icon_data