Drawing areas fails if no priority block exists

[otbutz]

Describe the bug

Drawing an area fails silently if no priority block is present in the custom model.

Console log

Uncaught TypeError: r.priority is undefined
    <anonymous> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    finishDrawing http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleUpEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleMapBrowserEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handlePointerUp_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    zd http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handlePointerDown_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    zd http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    Iy http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleTargetChanged_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    notify http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    set http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    setTarget http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    _o http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    il http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    ku http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    wu http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    w http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    P http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    1196 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    2851 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    7799 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    3961 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    4470 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonymous> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonymous> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonymous> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
bundle.c784ce2a89264a26b504.js:2:1348102
    <anonym> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    finishDrawing http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleUpEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleMapBrowserEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handlePointerUp_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    (Async: EventListener.handleEvent)
    zd http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handlePointerDown_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    (Async: EventListener.handleEvent)
    zd http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    Iy http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    handleTargetChanged_ http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    dispatchEvent http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    notify http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    set http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    setTarget http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    _o http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    il http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    ku http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    wu http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    w http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    P http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    (Async: EventHandlerNonNull)
    1196 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    2851 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    7799 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    3961 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    4470 http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    n http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonym> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonym> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2
    <anonym> http://localhost:8989/maps/bundle.c784ce2a89264a26b504.js:2

To Reproduce

Open the max speed example in the custom model editor and try to draw an area.

Expected behavior

Drawing an area should modify an existing priority block or create a new one if it doesn't exist yet.

[karussell]

Yes, we should probably avoid adding the priority statement as @easbar suggested once. My idea was to add the "blocking statement" directly because this is what most users probably want, but we could show how an area is used in an example.