Re-add: Update online numbers on drag-drop

pesterchum.py

@@ -595,6 +595,8 @@ class chumArea(RightClickTree):
             self.mainwindow.chumdb.setGroup(chumLabel.chum.handle, group)
             self.takeItem(chumLabel)
             self.addItem(chumLabel)
+            if self.mainwindow.config.showOnlineNumbers():
+                self.showOnlineNumbers()
 
     def chumoptionsmenu(self):
         self.optionsMenu = self.chumoptions
@@ -678,6 +680,7 @@ class chumArea(RightClickTree):
                 if self.openGroups[i]:
                     child_1.setExpanded(True)
     def showOnlineNumbers(self):
+        if hasattr(self, 'groups'):
           self.hideOnlineNumbers()
           totals = {'Chums': 0}
           online = {'Chums': 0}