Fix issue with expected types.

vector/src/main/java/im/vector/app/features/home/room/detail/timeline/factory/MessageItemFactory.kt

@@ -245,7 +245,7 @@ class MessageItemFactory @Inject constructor(
                 .pollQuestion(createPollQuestion(informationData, pollViewState.question, callback))
                 .canVote(pollViewState.canVote)
                 .votesStatus(pollViewState.votesStatus)
-                .optionViewStates(pollViewState.optionViewStates)
+                .optionViewStates(pollViewState.optionViewStates.orEmpty())
                 .edited(informationData.hasBeenEdited)
                 .highlighted(highlight)
                 .leftGuideline(avatarSizeProvider.leftGuideline)

vector/src/main/java/im/vector/app/features/spaces/preview/SpacePreviewController.kt

@@ -65,7 +65,7 @@ class SpacePreviewController @Inject constructor(
                 subSpaceItem {
                     id(child.roomId)
                     roomId(child.roomId)
-                    title(child.name)
+                    title(child.name ?: "")
                     depth(depth)
                     avatarUrl(child.avatarUrl)
                     avatarRenderer(host.avatarRenderer)