ofz#4901 Divide-by-zero

Change-Id: Ifc38234b4a99b205681b18b0d0bd2ec2a65dc515
Reviewed-on: https://gerrit.libreoffice.org/47317Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

lotuswordpro/source/filter/lwpoleobject.cxx

@@ -154,7 +154,7 @@ void LwpGraphicOleObject::GetGrafScaledSize(double & fWidth, double & fHeight)
                     fSclGrafWidth = fWidth;
                     fSclGrafHeight = fHeight;
                 }
-                else if (nScalemode & LwpLayoutScale::MAINTAIN_ASPECT_RATIO)
+                else if (nScalemode & LwpLayoutScale::MAINTAIN_ASPECT_RATIO && fHeight != 0.0 && fDisFrameHeight != 0.0)
                 {
                     if (fWidth/fHeight >= fDisFrameWidth/fDisFrameHeight)
                     {