Fixes #1940839. Prevents NPE in RelativeLayout when a non-existing View is

                            throw new IllegalStateException("A view cannot have a dependency" +

                                    " on itself");

                        }

                        if (dependency == null) {

                            continue;

                        }

                        // Add the current node as a dependent

                        dependency.dependents.add(node);

                        // Add a dependency to the current node