Fixes #55

Signed-off-by: Janne Koschinski <janne@kuschku.de>

viewmodel/src/main/java/de/kuschku/quasseldroid/viewmodel/QuasselViewModel.kt

@@ -201,8 +201,8 @@ class QuasselViewModel : ViewModel() {
       if (bufferInfo?.type?.hasFlag(Buffer_Type.ChannelBuffer) == true) {
         session.liveNetworks().switchMap { networks ->
           val network = networks[bufferInfo.networkId]
-          val ircChannel = network?.ircChannel(bufferInfo.bufferName)
-          if (ircChannel != null) {
+          network?.liveIrcChannel(bufferInfo.bufferName)?.switchMap { ircChannel ->
+            if (ircChannel != IrcChannel.NULL) {
               ircChannel.liveIrcUsers().switchMap { users ->
                 combineLatest<IrcUserItem>(
                   users.map<IrcUser, Observable<IrcUserItem>?> {
@@ -231,6 +231,7 @@ class QuasselViewModel : ViewModel() {
               Observable.just(emptyList())
             }
           }
+        }
       } else {
         Observable.just(emptyList())
       }