there might be no model

Change-Id: I9c384587c127ca077803bf8aae63d0e54eda6aaf
(cherry picked from commit be95c743)
Reviewed-on: https://gerrit.libreoffice.org/18025Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

svx/source/svdraw/svdoedge.cxx

@@ -2264,7 +2264,7 @@ void SdrEdgeObj::NbcResize(const Point& rRefPnt, const Fraction& aXFact, const F
     ResizeXPoly(*pEdgeTrack,rRefPnt,aXFact,aYFact);
 
     // if resize is not from paste, forget user distances
-    if(!GetModel()->IsPasteResize())
+    if (!GetModel() || !GetModel()->IsPasteResize())
     {
         aEdgeInfo.aObj1Line2 = Point();
         aEdgeInfo.aObj1Line3 = Point();