[BUGFIX] happy eye: null pointer if no connection was etablished

src/main/java/eu/siacs/conversations/utils/Resolver.java

@@ -274,6 +274,10 @@ public class Resolver {
         try {
             result = executor.invokeAny(r);
             executor.shutdown();
+            if (result == null) {
+                Log.i(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball unable to connect to one address");
+                return null;
+            }
             Thread disconnector = new Thread(() -> {
                 while (true) {
                     try {
@@ -428,7 +432,10 @@ public class Resolver {
         @Override
         public Result call() throws Exception {
             this.connect();
-            return this.socket.isConnected() ? this : null;
+            if (this.socket != null && this.socket.isConnected()) {
+	        return this ;
+            }
+            return null;
         }
 
         public ContentValues toContentValues() {