Cleanup and safer Json model.

vector-config/src/main/java/im/vector/app/config/Config.kt

@@ -42,8 +42,10 @@ object Config {
     const val ENABLE_LOCATION_SHARING = true
     const val LOCATION_MAP_TILER_KEY = "fU3vlMsMn4Jb6dnEIFsx"
 
-    /// Whether to read the `io.element.functional_members` state event
-    // and exclude any service members when computing a room's name and avatar.
+    /**
+     * Whether to read the `io.element.functional_members` state event
+     * and exclude any service members when computing a room's name and avatar.
+     */
     const val SUPPORT_FUNCTIONAL_MEMBERS = true
 
     /**

vector/src/main/java/im/vector/app/features/room/FunctionalMembersState.kt

@@ -26,11 +26,13 @@ private const val FUNCTIONAL_MEMBERS_STATE_EVENT_TYPE = "io.element.functional_m
 
 @JsonClass(generateAdapter = true)
 data class FunctionalMembersContent(
-        @Json(name = "service_members") val userIds: List<String>
+        @Json(name = "service_members") val userIds: List<String>? = null
 )
 
 fun StateService.getFunctionalMembers(): List<String> {
-    return getStateEvent(FUNCTIONAL_MEMBERS_STATE_EVENT_TYPE, QueryStringValue.IsEmpty)?.let {
-        it.content.toModel<FunctionalMembersContent>()?.userIds
-    }.orEmpty()
+    return getStateEvent(FUNCTIONAL_MEMBERS_STATE_EVENT_TYPE, QueryStringValue.IsEmpty)
+            ?.content
+            ?.toModel<FunctionalMembersContent>()
+            ?.userIds
+            .orEmpty()
 }

vector/src/main/java/im/vector/app/features/room/VectorRoomDisplayNameFallbackProvider.kt

@@ -32,10 +32,12 @@ class VectorRoomDisplayNameFallbackProvider @Inject constructor(
 
     override fun excludedUserIds(roomId: String): List<String> {
         if (!Config.SUPPORT_FUNCTIONAL_MEMBERS) return emptyList()
-        return activeSessionHolder.get().getSafeActiveSession()
-                ?.getRoom(roomId)?.let { room ->
-                    room.stateService().getFunctionalMembers()
-                }.orEmpty()
+        return activeSessionHolder.get()
+                .getSafeActiveSession()
+                ?.getRoom(roomId)
+                ?.stateService()
+                ?.getFunctionalMembers()
+                .orEmpty()
     }
 
     override fun getNameForRoomInvite(): String {