Fixed crash. If we have no points in the seam allowence path just don't show

him.

--HG--
branch : develop

src/app/geometry/vdetail.cpp

@@ -461,6 +461,8 @@ QPainterPath VDetail::ContourPath(const VContainer *data) const
 
     // seam allowence
     if (getSeamAllowance() == true)
+    {
+        if (not pointsEkv.isEmpty())
         {
             QPainterPath ekv;
             ekv.moveTo(pointsEkv.at(0));
@@ -472,6 +474,7 @@ QPainterPath VDetail::ContourPath(const VContainer *data) const
             path.addPath(ekv);
             path.setFillRule(Qt::WindingFill);
         }
+    }
 
     return path;
 }