NullPointerException in org.eclipse.paho.client.mqttv3.internal.ConnectActionListener.onFailure()

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- [x] Bug exists Release Version 1.2.5 ( Master Branch)
- [x] Bug exists in MQTTv3 Client on Snapshot Version 1.2.6-SNAPSHOT (Develop Branch)
- [x] Bug exists in MQTTv5 Client on Snapshot Version 1.2.6-SNAPSHOT (Develop Branch)

We meet NullPointerException during automatic tests. It happened when connection is closed and reconnect timer try reconnect. Please check the logs below.

- log1:
java.lang.NullPointerException: Attempt to get length of null array at org.eclipse.paho.client.mqttv3.internal.ConnectActionListener.onFailure(Proguard:119) at org.eclipse.paho.client.mqttv3.internal.ConnectActionListener.connect(Proguard:188) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.connect(Proguard:774) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.attemptReconnect(Proguard:1408)

- log2:
java.lang.NullPointerException: Attempt to invoke virtual method 'void org.eclipse.paho.client.mqttv3.internal.CommsCallback.setReconnectCallback(org.eclipse.paho.client.mqttv3.MqttCallbackExtended)' on a null object reference\r\n"
b'06-16 16:22:10.970 E/AndroidRuntime( 3573): \tat org.eclipse.paho.client.mqttv3.internal.ClientComms.setReconnectCallback(Proguard:586)\r\n'
b'06-16 16:22:10.970 E/AndroidRuntime( 3573): \tat org.eclipse.paho.client.mqttv3.MqttAsyncClient.connect(Proguard:757)\r\n'
b'06-16 16:22:10.970 E/AndroidRuntime( 3573): \tat org.eclipse.paho.client.mqttv3.MqttAsyncClient.attemptReconnect(Proguard:1408)\r\n'

Thanks.