throw error if client doesnt support groups

Author: nplasterer

example/src/main/java/org/xmtp/android/example/MainViewModel.kt

@@ -77,7 +77,7 @@ class MainViewModel : ViewModel() {
     val stream: StateFlow<MainListItem?> =
         stateFlow(viewModelScope, null) { subscriptionCount ->
             if (ClientManager.clientState.value is ClientManager.ClientState.Ready) {
-                ClientManager.client.conversations.stream()
+                ClientManager.client.conversations.streamAll()
                     .flowWhileShared(
                         subscriptionCount,
                         SharingStarted.WhileSubscribed(1000L)

library/src/main/java/org/xmtp/android/library/Conversations.kt

@@ -511,7 +511,8 @@ data class Conversations(
             }
         }
         val stream = libXMTPConversations?.stream(groupCallback)
-        awaitClose { stream?.end() }
+            ?: throw XMTPException("Client does not support Groups")
+        awaitClose { stream.end() }
     }
 
     /**