Add error condition for Control EXIT_TREE notif
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@ -471,6 +471,8 @@ void Control::_notification(int p_notification) {
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_size_changed();
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} break;
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case NOTIFICATION_EXIT_TREE: {
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ERR_FAIL_COND(!get_viewport());
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get_viewport()->_gui_remove_control(this);
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} break;
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