my-weather-indicator icon is "?" when thunderstorm condition.

[japan area & YAHOO weather service]
open weather forecast when thunderstorm condition.
weather is stay "N/A" & "Error:thunderstorms".
See screenshot.

$ lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 12.04.3 LTS
Release: 12.04
Codename: precise

$ uname -a
Linux 26897LJ 3.8.0-29-generic #42~precise1-Ubuntu SMP Wed Aug 14 16:19:23 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep my-weather
ii my-weather-indicator 0.6.3-0extras12.04.3 Get weather information for your town with My-Weather-Indicator

$ cat ~/.config/my-weather-indicator/my-weather-indicator.conf
{"show-temperature2": true, "24h": true, "icon-light": true, "second-location": false, "longitude": 139.57826, "onwidget2hide": false, "wp2-y": 0, "wp2-x": 0, "temperature": "C", "wp1-x": 0, "wp1-y": 0, "latitude2": 0, "autolocation": false, "snow": "cm", "version": "0.6.3", "wwo-key": "", "location": "\u4fdd\u571f\u30f6\u8c37\u533a", "latitude": 35.46113, "onwidget1hide": false, "show-notifications": false, "wu-key": "", "first-time": false, "location2": "", "longitude2": 0, "skin2": "/opt/extras.ubuntu.com/my-weather-indicator/share/my-weather-indicator/skins/anotherone", "skin1": "/opt/extras.ubuntu.com/my-weather-indicator/share/my-weather-indicator/skins/anotherone", "pressure": "mb", "visibility": "km", "rain": "mm", "weather-service": "yahoo", "main-location": true, "onwidget2top": false, "show-notifications2": true, "refresh": 0.5, "show-temperature": true, "showintaskbar2": false, "showintaskbar1": false, "widget2": false, "widget1": false, "wind": "m/s", "onwidget1top": false}