fix when website is offline

weboob/backends/geolocip/backend.py

@@ -21,7 +21,7 @@ from __future__ import with_statement
 
 from weboob.capabilities.geolocip import ICapGeolocIp, IpLocation
 from weboob.tools.backend import BaseBackend
-from weboob.tools.browser import BaseBrowser
+from weboob.tools.browser import BaseBrowser, BrowserUnavailable
 
 
 __all__ = ['GeolocIpBackend']
@@ -44,6 +44,9 @@ class GeolocIpBackend(BaseBackend, ICapGeolocIp):
 
             content = self.browser.readurl('http://www.geolocip.com/?s[ip]=%s&commit=locate+IP!' % str(ipaddr))
 
+            if content is None:
+                raise BrowserUnavailable()
+
             tab = {}
             last_line = ''
             line = ''