Remesher: prevent failure of the second compute in case of not closed 2D mesh

src/NETGENPlugin/NETGENPlugin_Remesher_2D.cxx

@@ -56,6 +56,13 @@ using namespace nglib;
 // #endif
 //   extern STLParameters stlparam;
 // }
+namespace nglib
+{
+#if defined(NETGEN_V5) && defined(WIN32)
+        DLL_HEADER
+#endif
+  extern netgen::Array<netgen::Point<3> > readedges;
+}
 
 namespace
 {
@@ -213,6 +220,8 @@ namespace
 
   void HoleFiller::AddHoleBorders( Ng_STL_Geometry * ngStlGeo )
   {
+    nglib::readedges.SetSize(0);
+
     for ( size_t i = 0; i < myHole.size(); ++i )
       for ( size_t iP = 1; iP < myHole[i].size(); ++iP )
       {