fix crash in remeshUnrecoveredEdges

Mesh/meshGFace.cpp

@@ -91,6 +91,7 @@ static void remeshUnrecoveredEdges(std::map<MVertex*, BDS_Point*> &recoverMapInv
     for(int i = 0; i < N; i++){
       MVertex *v1 = itr->ge->lines[i]->getVertex(0);
       MVertex *v2 = itr->ge->lines[i]->getVertex(1);
+      if(recoverMapInv.count(v1) && recoverMapInv.count(v2)){
         BDS_Point *pp1 = recoverMapInv[v1];
         BDS_Point *pp2 = recoverMapInv[v2];
         if((pp1->iD == p1 && pp2->iD == p2) || (pp1->iD == p2 && pp2->iD == p1)){
@@ -136,6 +137,8 @@ static void remeshUnrecoveredEdges(std::map<MVertex*, BDS_Point*> &recoverMapInv
           newLines.push_back(itr->ge->lines[i]);
         }
       }
+    }
+
     itr->ge->lines = newLines;
     itr->ge->mesh_vertices.clear();
     N = itr->ge->lines.size();