Imported some fixes to oauthtwitter from its issue tracker

hrafn.py

@@ -64,18 +64,15 @@ class Hrafn():
         self.num_entries = int(config.get('global', 'entries'))
         self.refresh_time = int(config.get('global', 'refreshtime'))
 
+        if not self.db.has_key('active_user'):
+                self.db['active_user'] = None
+
         # Now set up the accounts and their corresponding APIs
         self.accounts = {}
         for token in self.db['tokens']:
             api = apithreads.CustomApi(token)
             self.add_account(api)
 
-        if not self.db.has_key('active_user'):
-            try:
-                self.db['active_user'] = self.accounts.keys()[0]
-            except IndexError:
-                self.db['active_user'] = None
-
         self.username = self.db['active_user']
 
         try:
@@ -148,7 +145,7 @@ class Hrafn():
 
 
     def update_account_label(self):
-        if self.username:
+        if self.username is not None:
             self.account_label.set_text(self.username + ': ')