ScriptForge (SF_Exception) fix console error

In the scenario where
- the console is opened in modal mode,
- the console is closed immediately,
- the exception.ConsoleClear() is run,
an abort occurs:
   Object variable not set

Fixed now.

Change-Id: Ib7de836457e77786b0e29a68eaf64e8bd6aa8a0e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/194846
Tested-by: Jenkins
Reviewed-by: Jean-Pierre Ledure <jp@ledure.be>

wizards/source/scriptforge/SF_Exception.xba

@@ -1329,7 +1329,7 @@ Private Sub _ConsoleRefresh()
 		'	Do nothing if console inactive
 		If IsNull(.ConsoleDialog) Then GoTo Finally
 		If Not .ConsoleDialog._IsStillAlive(False) Then		'	False to not generate an error when dead
-			Set .ConsoleControl = .ConsoleControl.Dispose()
+			If Not IsNull(.ConsoleControl) Then Set .ConsoleControl = .ConsoleControl.Dispose()
 			Set .ConsoleDialog = Nothing
 			GoTo Finally
 		End If