GeoPluginGeocoder can return successful but fail to parse_xml

[RobertLowe]

-244-199-0.21566 14:48:16 ERROR Caught an error during GeoPluginGeocoder geocoding call: undefined method `text' for nil:NilClass

https://github.com/andre/geokit-gem/blob/master/lib/geokit/geocoders.rb#L755
https://github.com/andre/geokit-gem/blob/master/lib/geokit/geocoders.rb#L761

  def self.parse_xml(xml)
    xml = REXML::Document.new(xml)
    geo = GeoLoc.new
    geo.provider='geoPlugin'
    geo.city = xml.elements['//geoplugin_city'].text
    geo.state = xml.elements['//geoplugin_region'].text
    geo.country_code = xml.elements['//geoplugin_countryCode'].text
    geo.lat = xml.elements['//geoplugin_latitude'].text.to_f
    geo.lng = xml.elements['//geoplugin_longitude'].text.to_f
    geo.success = !!geo.city && !geo.city.empty?
    return geo
  end