Add assertions to isVertexRegular

QTProject/subdivision.cpp

@@ -722,9 +722,11 @@ QVector<unsigned int> Subdivision::patchIBToTriangleIB(QVector<unsigned int> ib)
 
 bool isVertexRegular(Triangle &triangle, Triangle::Neighbor current_neighbor, QMap<Triangle, Triangle::Neighbors> neighbors) {
     unsigned int count = 1;
+    assert(current_neighbor.triangle != NULL);
     while (count < 6 && *current_neighbor.triangle != triangle) {
         count++;
         current_neighbor = neighbors.value(*current_neighbor.triangle).get_neighbor(rotate_edge_name(current_neighbor.edge.name));
+        assert(current_neighbor.triangle != NULL);
     }
     return count == 6 && *current_neighbor.triangle == triangle;
 }