SdrObjCustomShape::GetCustomShapeEngine: aEngine can't be empty at this point

Change-Id: I7c656c461ab6bdf53d14ec5804ac82e219c0aef1
coverity#704860 Unchecked dynamic_cast

Change-Id: I4a6cf43eaf9626bdb1d486476d3e797fcab5ab13
sw: fix indentation in rtfsdrexport

Change-Id: I5499007c88659b2d235c765ba352e2bc4a8a3eb8