Fix offline mode and local DB initialization

src/main/java/envoy/client/net/Client.java

@@ -223,6 +223,7 @@ public class Client implements Closeable {
 		checkOnline();
 		Map<String, Contact> users = new HashMap<>();
 		contacts.forEach(u -> users.put(u.getName(), u));
+		users.put(sender.getName(), sender);
 		return users;
 	}