tdf#139493 EditViewCallbacks might not implement EditViewPopupParent

in which case fallback to the vcl::Window

Change-Id: Idc72f04ce72b1bcd42d80869e0ee86b653343a17
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109234
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

editeng/source/editeng/impedit.cxx

@@ -826,7 +826,11 @@ OutputDevice& ImpEditView::GetOutputDevice() const
 weld::Widget* ImpEditView::GetPopupParent(tools::Rectangle& rRect) const
 {
     if (EditViewCallbacks* pCallbacks = getEditViewCallbacks())
-        return pCallbacks->EditViewPopupParent();
+    {
+        weld::Widget* pParent = pCallbacks->EditViewPopupParent();
+        if (pParent)
+            return pParent;
+    }
     return weld::GetPopupParent(*pOutWin, rRect);
 }