tdf#137713 don't crash if there is no m_xEditView

Change-Id: I8b35459c7d5a704d9e2c0e2bfa4fce1aef152846
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/104757
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sc/source/ui/app/inputwin.cxx b/sc/source/ui/app/inputwin.cxx
index 1632ce1..5d90128 100644
--- a/sc/source/ui/app/inputwin.cxx
+++ b/sc/source/ui/app/inputwin.cxx
@@ -1533,10 +1533,12 @@ bool ScTextWnd::MouseButtonDown( const MouseEvent& rMEvt )
            TextGrabFocus();
    }

    bool bClickOnSelection = false;
    if (m_xEditView)
    {
        m_xEditView->SetEditEngineUpdateMode( true );

    bool bClickOnSelection = m_xEditView->IsSelectionAtPoint(rMEvt.GetPosPixel());
        bClickOnSelection = m_xEditView->IsSelectionAtPoint(rMEvt.GetPosPixel());
    }
    if (!bClickOnSelection)
    {
        rtl::Reference<TransferDataContainer> xTransferable(new TransferDataContainer);