wxGUI: fix rendering behavior in GUI when only d.* is entered in command console without any map

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@69704 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/lmgr/frame.py

@@ -793,9 +793,8 @@ class GMFrame(wx.Frame):
             # add layer into layer tree
             lname, found = GetLayerNameFromCmd(command, fullyQualified=True,
                                                layerType=layertype)
-            self.GetLayerTree().AddLayer(ltype=layertype, lchecked=True,
-                                         lname=lname,
-                                         lcmd=command)
+            self.GetLayerTree().AddLayer(ltype=layertype, lchecked=True if lname else None,
+                                         lname=lname, lcmd=command)
 
     def GetLayerNotebook(self):
         """Get Layers Notebook"""