[core] Fix bug when starting with no accounts saved, thanks to darkne…

…ss51 for reporting via github

amsn2/core/userinterface_manager.py

@@ -66,7 +66,7 @@ def loadLogin(self, accounts):
         if not self._login:
             self._login = self._ui.aMSNLoginWindow(self._core, self._main)
             self._login.setAccounts(accounts)
-            if accounts[0].autologin:
+            if accounts and accounts[0].autologin:
                 self._core.signinToAccount(self._login, accounts[0])
 
         self._main.setTitle("aMSN 2 - Login")