logout;more robust async

deluge/ui/webui/webui_plugin/templates/advanced/part_stats.html

@@ -13,6 +13,8 @@ $else:
     $:render.part_button('POST', '/refresh/on', _('Enable'), 'tango/view-refresh.png')
 $#end
 
+$:render.part_button('POST', '/logout', _('Logout'), 'tango/system-log-out.png')
+
 </div>
 
 <div class="panel"  id='stats_panel'>

deluge/ui/webui/webui_plugin/templates/deluge/part_stats.html

@@ -12,6 +12,9 @@ $else:
     $_('Off')  
     $:render.part_button('POST', '/refresh/on', _('Enable'), 'tango/view-refresh.png')
 $#end
+
+$:render.part_button('POST', '/logout', _('Logout'), 'tango/system-log-out.png')
+
 </div>
 
 <div class="panel"  id='stats_panel'>

deluge/ui/webui/webui_plugin/webserver_common.py

@@ -118,12 +118,14 @@ class SyncProxyFunction:
         self.client = client
 
     def __call__(self,*args,**kwargs):
-        sync_result = []
         func = getattr(self.client,self.func_name)
 
         if self.has_callback(func):
+            sync_result = []
             func(sync_result.append,*args, **kwargs)
             self.client.force_call(block=True)
+            if not  sync_result:
+                return None
             return sync_result[0]
         else:
             ws.log.debug('no-cb: %s' % self.func_name)