Fixes the following exception thrown if the user had entered a non-existend XMPP domain:
java.lang.IllegalArgumentException: Must provide at least one InetAddress
at org.jivesoftware.smack.util.dns.HostAddress.<init>(HostAddress.java:55)
at org.jivesoftware.smack.util.dns.DNSResolver.lookupHostAddress(DNSResolver.java: 56)
at org.jivesoftware.smack.util.DNSUtil.resolveDomain(DNSUtil.java:209)
at org.jivesoftware.smack.util.DNSUtil.resolveXMPPServiceDomain(DNSUtil.java:136)
at org.jivesoftware.smack.AbstractXMPPConnection.populateHostAddresses(AbstractXMP PConnection.java:626)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectUsingConfiguration(XMPPTCPC onnection.java:556)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectInternal(XMPPTCPConnection. java:888)
at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.ja va:377)
Thanks to Grigory Fedorov for reporting.