Allow clearing RoutePropertiesBox
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@@ -111,7 +111,12 @@ RoutePropertiesBox::set_route (std::shared_ptr<Route> r)
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if (r == _route) {
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return;
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}
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assert (r);
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if (!r) {
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drop_route ();
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return;
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}
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_route = r;
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_route_connections.drop_connections ();
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