Make sketch not fail on start when the sphere is in the viewer.

diff --git a/src/GeomAPI/GeomAPI_Edge.cpp b/src/GeomAPI/GeomAPI_Edge.cpp
index 9927c2ae9cc3bb899fcb53611073f05d3d67b436..37862ec309ced4a18bf32af4bea3fad5be49e409 100644 (file)
--- a/src/GeomAPI/GeomAPI_Edge.cpp
+++ b/src/GeomAPI/GeomAPI_Edge.cpp
@@ -67,6 +67,8 @@ bool GeomAPI_Edge::isLine() const
   const TopoDS_Shape& aShape = const_cast<GeomAPI_Edge*>(this)->impl<TopoDS_Shape>();
   double aFirst, aLast;
   Handle(Geom_Curve) aCurve = BRep_Tool::Curve((const TopoDS_Edge&)aShape, aFirst, aLast);
+  if (aCurve.IsNull()) // degenerative edge
+    return false;
   if (aCurve->IsKind(STANDARD_TYPE(Geom_Line)))
     return true;
   return false;
@@ -77,6 +79,8 @@ bool GeomAPI_Edge::isCircle() const
   const TopoDS_Shape& aShape = const_cast<GeomAPI_Edge*>(this)->impl<TopoDS_Shape>();
   double aFirst, aLast;
   Handle(Geom_Curve) aCurve = BRep_Tool::Curve((const TopoDS_Edge&)aShape, aFirst, aLast);
+  if (aCurve.IsNull()) // degenerative edge
+    return false;
   if (aCurve->IsKind(STANDARD_TYPE(Geom_Circle)))
   {
     // Check the difference of first and last parameters to be equal to the curve period
@@ -91,6 +95,8 @@ bool GeomAPI_Edge::isArc() const
   const TopoDS_Shape& aShape = const_cast<GeomAPI_Edge*>(this)->impl<TopoDS_Shape>();
   double aFirst, aLast;
   Handle(Geom_Curve) aCurve = BRep_Tool::Curve((const TopoDS_Edge&)aShape, aFirst, aLast);
+  if (aCurve.IsNull()) // degenerative edge
+    return false;
   if (aCurve->IsKind(STANDARD_TYPE(Geom_Circle)))
   {
     // Check the difference of first and last parameters is not equal the curve period
@@ -105,6 +111,8 @@ bool GeomAPI_Edge::isEllipse() const
   const TopoDS_Shape& aShape = const_cast<GeomAPI_Edge*>(this)->impl<TopoDS_Shape>();
   double aFirst, aLast;
   Handle(Geom_Curve) aCurve = BRep_Tool::Curve((const TopoDS_Edge&)aShape, aFirst, aLast);
+  if (aCurve.IsNull()) // degenerative edge
+    return false;
   if (aCurve->IsKind(STANDARD_TYPE(Geom_Ellipse)))
     return true;
   return false;