Return a default empty PublicSetting if server does not provide any

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmPublicSettingRepository.java

@@ -5,6 +5,9 @@ import android.support.v4.util.Pair;
 
 import com.hadisatrio.optional.Optional;
 
+import javax.annotation.Nullable;
+
+import chat.rocket.core.PublicSettingsConstants;
 import chat.rocket.core.models.PublicSetting;
 import chat.rocket.core.repositories.PublicSettingRepository;
 import chat.rocket.persistence.realm.RealmStore;
@@ -31,6 +34,7 @@ public class RealmPublicSettingRepository extends RealmRepository
                     if (pair.first == null) {
                         return Flowable.empty();
                     }
+
                     return pair.first.where(RealmPublicSetting.class)
                             .equalTo(RealmPublicSetting.ID, id)
                             .findAll()
@@ -39,8 +43,19 @@ public class RealmPublicSettingRepository extends RealmRepository
                 pair -> close(pair.first, pair.second)
         )
                 .unsubscribeOn(AndroidSchedulers.from(Looper.myLooper()))
-        .filter(it -> it.isLoaded() && it.isValid() && it.size() > 0)
-        .map(it -> Optional.of(it.get(0).asPublicSetting()))
+                .filter(it -> it.isLoaded() && it.isValid())
+                .map(it -> {
+                    if (it.size() > 0) {
+                        return Optional.of(it.get(0).asPublicSetting());
+                    }
+
+                    PublicSetting defaultSetting = PublicSetting.builder()
+                            .setId(id)
+                            .setValue("")
+                            .setUpdatedAt(0L)
+                            .build();
+                    return Optional.of(defaultSetting);
+                })
                 .first(Optional.absent()));
     }
 }