fix: respond with error when app is not connected

[de-sh]

Closes #

Changes

Why?

Trials Performed

1. Start uplink with following config:

action_redirections = { "send_file" = "load_file" }

[tcpapps.1]
port = 5555
actions = [{ name = "load_file" }]

[downloader]
actions = [{ name = "send_file" }]
path = "/var/tmp/ota-file"

2. Trigger a send_file action on uplink with no app connected to handle load_file

 2023-04-29T13:29:03.808485Z  INFO uplink::collector::downloader: Firmware downloaded successfully

  2023-04-29T13:29:03.808528Z DEBUG uplink::base::serializer: publishing on /tenants/demo/devices/615/action/status with size = 108

  2023-04-29T13:29:03.808758Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "388", device_id: None, sequence: 8, timestamp: 1682774943808, state: "Downloaded", progress: 100, errors: [], done_response: Some(Action { device_id: None, action_id: "388", kind: "process", name: "send_file", payload: "{\"url\":\"https://firmware.stage.bytebeam.io/api/v1/file/4cb248bb-26ba-44cb-9df4-d78a22386371/artifact\",\"content_length\":72299,\"file_name\":\"Screenshot from 2023-04-27 10-28-07.png\",\"download_path\":\"/var/tmp/ota-file/send_file/Screenshot from 2023-04-27 10-28-07.png\"}" }) }

  2023-04-29T13:29:03.808840Z DEBUG uplink::base::serializer: publishing on /tenants/demo/devices/615/action/status with size = 108

  2023-04-29T13:29:03.808883Z ERROR uplink::collector::tcpjson: Error = No receiver connected, app name: 1; port: 1

  2023-04-29T13:29:03.808944Z  INFO uplink::base::bridge: Action response = ActionResponse { action_id: "388", device_id: None, sequence: 0, timestamp: 1682774943808, state: "Failed", progress: 100, errors: ["No receiver connected, app name: 1; port: 1"], done_response: None }