code: def unblock_user_signals(self, name, ignore_error=False):
          
          x = self._find_parameter(name.split("/"), quiet=ignore_error)
  
          # if it pooped.
          if x==None: return None
              
          # reconnect it to all its functions
          if name in self._connection_lists:
              for f in self._connection_lists[name]: x.sigValueChanged.connect(f)
          
          return self
docs: Reconnects the user-defined signals for the specified 
          parameter name (blocked with "block_user_signal_changed")
          
          Note this only affects those connections made with 
          connect_signal_changed(), and I do not recommend adding new connections
          while they're blocked!