fix(chat): have imageData be nullable

Signed-off-by: Brandon McAnsh <git@bmcreations.dev>

Author: bmc08gt

api/src/main/java/com/getcode/model/chat/Chat.kt

@@ -33,15 +33,15 @@ data class Chat(
     val cursor: Cursor,
     val messages: List<ChatMessage>
 ) {
-    val imageData: Any
+    val imageData: Any?
         get() {
             return when (type) {
                 ChatType.Unknown -> id
                 ChatType.Notification -> id
                 ChatType.TwoWay -> {
                     members
                         .filterNot { it.isSelf }
-                        .firstNotNullOf {
+                        .firstNotNullOfOrNull {
                             if (it.identity != null) {
                                 it.identity.imageUrl.orEmpty()
                             } else {