avoid `else` in when statement.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/factories/event/TimelineItemContentMessageFactory.kt

@@ -39,6 +39,7 @@ import io.element.android.libraries.matrix.api.timeline.item.event.LocationMessa
 import io.element.android.libraries.matrix.api.timeline.item.event.MessageContent
 import io.element.android.libraries.matrix.api.timeline.item.event.NoticeMessageType
 import io.element.android.libraries.matrix.api.timeline.item.event.TextMessageType
+import io.element.android.libraries.matrix.api.timeline.item.event.UnknownMessageType
 import io.element.android.libraries.matrix.api.timeline.item.event.VideoMessageType
 import javax.inject.Inject
 
@@ -48,7 +49,7 @@ class TimelineItemContentMessageFactory @Inject constructor(
 ) {
 
     fun create(content: MessageContent): TimelineItemEventContent {
-        return when (val messageType = content.type) {
+        return when (val messageType = content.type ?: UnknownMessageType) {
             is EmoteMessageType -> TimelineItemEmoteContent(
                 body = messageType.body,
                 htmlDocument = messageType.formatted?.toHtmlDocument(),
@@ -130,7 +131,7 @@ class TimelineItemContentMessageFactory @Inject constructor(
                 htmlDocument = messageType.formatted?.toHtmlDocument(),
                 isEdited = content.isEdited,
             )
-            else -> TimelineItemUnknownContent
+            UnknownMessageType -> TimelineItemUnknownContent
         }
     }