Check address list is not empty

Fixes #1081

Author: acogoluegnes

src/main/java/com/rabbitmq/client/ConnectionFactory.java

@@ -1396,7 +1396,9 @@ public Connection newConnection(ExecutorService executor, String connectionName)
     }
 
     protected AddressResolver createAddressResolver(List<Address> addresses) {
-        if (addresses.size() > 1) {
+        if (addresses == null || addresses.isEmpty()) {
+            throw new IllegalArgumentException("Please provide at least one address to connect to");
+        } else if (addresses.size() > 1) {
             return new ListAddressResolver(addresses);
         } else {
             return new DnsRecordIpAddressResolver(addresses.get(0), isSSL());

src/test/java/com/rabbitmq/client/test/ConnectionFactoryTest.java

@@ -25,10 +25,7 @@
 
 import javax.net.SocketFactory;
 import java.io.IOException;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Queue;
+import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
@@ -306,4 +303,11 @@ public void shouldBeConfigurableUsingFluentAPI() throws Exception {
         assertThat(connectionFactory.isSSL()).isEqualTo(true);
     }
 
+    @Test
+    void newConnectionWithEmptyAddressListShouldThrowException() {
+        ConnectionFactory cf = new ConnectionFactory();
+        assertThatThrownBy(() -> cf.newConnection(Collections.emptyList()));
+        assertThatThrownBy(() -> cf.newConnection(new Address[] {}));
+    }
+
 }