my-weather-indicator package should depend on python-appindicator

my-weather-indicator package should depend on python-appindicator, because my-weather-indicator doesn't start until I install python-appindicator package, I get this error:
ubuntu@ubuntu:~$ /usr/share/my-weather-indicator/my-weather-indicator.py
Traceback (most recent call last):
  File "/usr/share/my-weather-indicator/my-weather-indicator.py", line 33, in <module>
    import appindicator
ImportError: No module named appindicator

apt-get install python-appindicator fixes this problem