Another GrabFocus during dispose

Change-Id: I89f8aa5e087e95c96d63695be0ec4e9b4fbe0a0c
(cherry picked from commit 4622823a)
Reviewed-on: https://gerrit.libreoffice.org/17706Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/ui/sidebar/CellLineStyleControl.cxx

@@ -96,14 +96,10 @@ void CellLineStyleControl::Initialize()
 
 void CellLineStyleControl::GetFocus()
 {
-    if(!mbVSfocus)
-    {
+    if (!mbVSfocus && maPushButtonMoreOptions)
         maPushButtonMoreOptions->GrabFocus();
-    }
-    else
-    {
+    else if (maCellLineStyleValueSet)
         maCellLineStyleValueSet->GrabFocus();
-    }
 }
 
 void CellLineStyleControl::SetAllNoSel()