Fix case where heroes is empty (fallback to display name of loaded members)

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/RoomMemberDisplayNameResolver.kt

@@ -5,20 +5,20 @@ import im.vector.matrix.android.api.session.room.model.RoomMember
 class RoomMemberDisplayNameResolver {
 
     fun resolve(userId: String, members: Map<String, RoomMember>): String? {
-        var displayName: String? = null
         val currentMember = members[userId]
+        var displayName = currentMember?.displayName
         // Get the user display name from the member list of the room
         // Do not consider null display name
+        
         if (currentMember != null && !currentMember.displayName.isNullOrEmpty()) {
             val hasNameCollision = members
                     .filterValues { it != currentMember && it.displayName == currentMember.displayName }
                     .isNotEmpty()
-            displayName = if (hasNameCollision) {
-                "${currentMember.displayName} ( $userId )"
-            } else {
-                currentMember.displayName
+            if (hasNameCollision) {
+                displayName = "${currentMember.displayName} ( $userId )"
             }
         }
+
         // TODO handle invited users
         /*else if (null != member && TextUtils.equals(member!!.membership, RoomMember.MEMBERSHIP_INVITE)) {
             val user = (mDataHandler as MXDataHandler).getUser(userId)