Fixes lack of feed updates for those that didn't follow any communities

amethyst/src/main/java/com/vitorpamplona/amethyst/model/nip65RelayList/OutboxRelaySetState.kt

@@ -70,7 +70,12 @@ class OutboxRelaySetState(
         usersToLoad
             .transformLatest { followList ->
                 val flows: List<StateFlow<NoteState>> = allRelayListFlows(followList)
-                val relayListFlows = combineAllFlows(flows)
+                val relayListFlows =
+                    if (flows.isEmpty()) {
+                        MutableStateFlow(emptySet())
+                    } else {
+                        combineAllFlows(flows)
+                    }
                 emitAll(relayListFlows)
             }.onStart {
                 emit(

amethyst/src/main/java/com/vitorpamplona/amethyst/model/topNavFeeds/CommunityRelayLoader.kt

@@ -27,6 +27,7 @@ import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip72ModCommunities.definition.CommunityDefinitionEvent
 import com.vitorpamplona.quartz.utils.mapOfSet
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.combine
 
 class CommunityRelayLoader {
@@ -81,8 +82,12 @@ class CommunityRelayLoader {
                         ?.stateFlow
                 }
 
-            return combine(noteMetadataFlows) { communityNotes ->
+            return if (noteMetadataFlows.isEmpty()) {
-                transformation(communitiesPerRelay(communityNotes, cache))
+                MutableStateFlow(transformation(emptyMap()))
+            } else {
+                combine(noteMetadataFlows) { communityNotes ->
+                    transformation(communitiesPerRelay(communityNotes, cache))
+                }
             }
         }
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/model/topNavFeeds/OutboxRelayLoader.kt

@@ -28,6 +28,7 @@ import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.utils.mapOfSet
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.combine
 
 class OutboxRelayLoader {
@@ -86,8 +87,12 @@ class OutboxRelayLoader {
                     note.flow().metadata.stateFlow
                 }
 
-            return combine(noteMetadataFlows) { outboxRelays ->
+            return if (noteMetadataFlows.isEmpty()) {
-                transformation(authorsPerRelay(outboxRelays, cache))
+                MutableStateFlow(transformation(emptyMap()))
+            } else {
+                combine(noteMetadataFlows) { outboxRelays ->
+                    transformation(authorsPerRelay(outboxRelays, cache))
+                }
             }
         }
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/model/topNavFeeds/allFollows/AllFollowsByOutboxTopNavFilter.kt

@@ -86,6 +86,7 @@ class AllFollowsByOutboxTopNavFilter(
             } else {
                 MutableStateFlow(emptyMap())
             }
+
         val communitiesPerRelay =
             if (communities != null) {
                 CommunityRelayLoader.toCommunitiesPerRelayFlow(communities, cache) { it }
@@ -116,6 +117,7 @@ class AllFollowsByOutboxTopNavFilter(
             } else {
                 emptyMap()
             }
+
         val communitiesPerRelay =
             if (communities != null) {
                 CommunityRelayLoader.communitiesPerRelaySnapshot(communities, cache) { it }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -222,7 +222,7 @@ class AccountViewModel(
                         }
                     }
 
-                if (flows != null) {
+                if (!flows.isNullOrEmpty()) {
                     combine(flows) {
                         it.any { it }
                     }