fix frmTreeView not being able to show when no match was found

app/DD_Clipboard_Searcher/frmStart.vb

@@ -417,8 +417,9 @@ Public Class frmStart
     End Sub
 
     Private Sub BisherigenAblaufAnzeigenToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles BisherigenAblaufAnzeigenToolStripMenuItem.Click
-        If _MatchForm IsNot Nothing Then
-            _MatchForm.ShowTreeView()
+        If CurrMatchTreeView.Nodes.Count > 0 Then
+            Dim oForm As New frmTreeView(CurrMatchTreeView.Nodes)
+            oForm.Show()
         End If
     End Sub
 End Class