Weird usage pattern required in multi-broker setup

[jfontsaballs]

✔️ Bug exists Release Version 1.2.5 (Master Branch)
❔ Bug exists in MQTTv3 Client on Snapshot Version 1.2.6-SNAPSHOT (Develop Branch)
❔ Bug exists in MQTTv5 Client on Snapshot Version 1.2.6-SNAPSHOT (Develop Branch)

I have a multi-broker setup, and I'm passing multiple URIs to the library via MqttConnectionOptions's setServerURIs in the connect method.

All MqttAsyncClient constructors require a single URI (not adequato to my use case), which is then ignored if setServerURIs is used. However this address is validated and an exception is throw if an empty string or a null is passed.

java.lang.IllegalArgumentException: missing scheme in broker URI: 
	at org.eclipse.paho.mqttv5.client.internal.NetworkModuleService.validateURI(NetworkModuleService.java:61)
	at org.eclipse.paho.mqttv5.client.MqttAsyncClient.<init>(MqttAsyncClient.java:573)
	at org.eclipse.paho.mqttv5.client.MqttAsyncClient.<init>(MqttAsyncClient.java:439)

As a workaround I can pass a fake address to the constructor, but it's ugly and confusing.