The BluetoothLE example fails when the cloudPublisher is undefined

[pierantoniomerlino]

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• Component affected:

  • Distribution

    • Installer name (e.g. kura_3.1.0_raspberry-pi-2-3_installer.deb): kura_4.0.0_raspberry-pi-2-3.deb
    • Platform (e.g. Raspberry pi 2): Raspberry Pi 3 B+
    • Kura version affected (e.g. Kura 3.1.0): 4.0.0
    • Java version (paste the result of java -version: 1.8.0_65
    • Host OS (e.g. Debian): Raspian
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• Textual description of the issue:

The org.eclipse.kura.example.ble.sensortag.tinyb bundle fails when the cloudPublisher is undefined.
The result is that after the sensor reading, the bundle tries to publish a message. Since the cloudPublisher is undefined, the thread is killed. Moreover, if the buttons are enabled, the following log message is shown when the button is pressed:

2018-10-23T09:24:30,780 [Thread-23] INFO  o.e.k.e.b.t.t.BluetoothLe - Received key 0
2018-10-23T09:24:30,781 [Thread-23] ERROR o.e.k.e.b.t.t.BluetoothLe - Can't publish message for buttons
java.lang.NullPointerException: null
	at org.eclipse.kura.example.ble.tisensortag.tinyb.BluetoothLe.doPublishKeys(BluetoothLe.java:201) ~[?:?]
	at org.eclipse.kura.example.ble.tisensortag.tinyb.BluetoothLe.lambda$0(BluetoothLe.java:301) ~[?:?]
	at org.eclipse.kura.example.ble.tisensortag.tinyb.TiSensorTag.lambda$7(TiSensorTag.java:1213) ~[?:?]
	at org.eclipse.kura.internal.ble.BluetoothLeNotification.run(BluetoothLeNotification.java:26) [org.eclipse.kura.ble.provider_1.0.200.jar:?]