Soft crashes for legacy calls when call room can't be found

[justjanne]

Type: Defect
Related: https://github.com/matrix-org/element-web-rageshakes/issues/20890

LegacyCallView will look up the callRoom, and pass it to LegacyCallViewHeader regardless of if the call could be found or not. If no call could be found, LegacyCallViewHeader will then try to access properties on this non-existing call, causing a soft-crash.

const { call, secondaryCall, pipMode, showApps, onMouseDownOnHeader } = this.props;

const callRoomId = LegacyCallHandler.instance.roomIdForCall(call);

const callRoom = callRoomId ? client.getRoom(callRoomId) : null;

<LegacyCallViewHeader
    onPipMouseDown={onMouseDownOnHeader}
    pipMode={pipMode}
    callRooms={[callRoom, secCallRoom]}
    onMaximize={this.onMaximizeClick}
/>

const [callRoom, onHoldCallRoom] = callRooms;
const callRoomName = callRoom.name;