don't pull changes if download rate is 0

oml/nodes.py

@@ -542,6 +542,8 @@ class Nodes(Thread):
             self.queue('pull')
 
     def _pull(self):
+        if not state.sync_enabled or settings.preferences.get('downloadRate') == 0:
+            return
         if state.activity and state.activity.get('activity') == 'import':
             return
         self._pulling = True

oml/state.py

@@ -8,6 +8,7 @@ node = False
 online = False
 tasks = False
 downloads = False
+sync_enabled = True
 tor = False
 update = False
 shutdown = False