dont request a workjob if we can see there is nothing to do

OpenSim/Region/CoreModules/Agent/Xfer/XferModule.cs

@@ -123,6 +123,11 @@ namespace OpenSim.Region.CoreModules.Agent.Xfer
                 {
                     double now = Util.GetTimeStampMS();
                     if(now - lastTimeTick > 1750.0)
+                    {
+
+                        if(Transfers.Count == 0 && NewFiles.Count == 0)
+                            lastTimeTick = now;
+                        else
                         {
                             inTimeTick = true;
 
@@ -140,6 +145,7 @@ namespace OpenSim.Region.CoreModules.Agent.Xfer
                                 "XferTimeTick");
                         }
                     }
+                }
                 Monitor.Exit(timeTickLock);
             }
         }