Use orEmpty()

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/crypto/verification/DefaultVerificationService.kt

@@ -1204,7 +1204,7 @@ internal class DefaultVerificationService @Inject constructor(
         Timber.i("## Requesting verification to user: $otherUserId with device list $otherDevices")
 
         val targetDevices = otherDevices ?: cryptoStore.getUserDevices(otherUserId)
-                ?.values?.map { it.deviceId } ?: emptyList()
+                ?.values?.map { it.deviceId }.orEmpty()
 
         val requestsForUser = pendingRequests.getOrPut(otherUserId) { mutableListOf() }
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/DefaultTimelineService.kt

@@ -103,7 +103,7 @@ internal class DefaultTimelineService @AssistedInject constructor(@Assisted priv
                     .sort(TimelineEventEntityFields.DISPLAY_INDEX, Sort.ASCENDING)
                     .findAll()
                     ?.mapNotNull { timelineEventMapper.map(it).takeIf { it.root.isImageMessage() || it.root.isVideoMessage() } }
-                    ?: emptyList()
+                    .orEmpty()
         }
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/sync/RoomTypingUsersHandler.kt

@@ -28,7 +28,7 @@ internal class RoomTypingUsersHandler @Inject constructor(@UserId private val us
 
     fun handle(realm: Realm, roomId: String, ephemeralResult: RoomSyncHandler.EphemeralResult?) {
         val roomMemberHelper = RoomMemberHelper(realm, roomId)
-        val typingIds = ephemeralResult?.typingUserIds?.filter { it != userId } ?: emptyList()
+        val typingIds = ephemeralResult?.typingUserIds?.filter { it != userId }.orEmpty()
         val senderInfo = typingIds.map { userId ->
             val roomMemberSummaryEntity = roomMemberHelper.getLastRoomMember(userId)
             SenderInfo(

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/typing/DefaultTypingUsersTracker.kt

@@ -37,6 +37,6 @@ internal class DefaultTypingUsersTracker @Inject constructor() : TypingUsersTrac
     }
 
     override fun getTypingUsers(roomId: String): List<SenderInfo> {
-        return typingUsers[roomId] ?: emptyList()
+        return typingUsers[roomId].orEmpty()
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/widgets/WidgetManager.kt

@@ -138,7 +138,7 @@ internal class WidgetManager @Inject constructor(private val integrationManager:
     ): LiveData<List<Widget>> {
         val widgetsAccountData = accountDataDataSource.getLiveAccountDataEvent(UserAccountDataTypes.TYPE_WIDGETS)
         return Transformations.map(widgetsAccountData) {
-            it.getOrNull()?.mapToWidgets(widgetTypes, excludedTypes) ?: emptyList()
+            it.getOrNull()?.mapToWidgets(widgetTypes, excludedTypes).orEmpty()
         }
     }
 

vector/src/main/java/im/vector/app/features/roomdirectory/RoomDirectoryViewModel.kt

@@ -204,9 +204,9 @@ class RoomDirectoryViewModel @AssistedInject constructor(@Assisted initialState:
             Timber.w("Try to join an already joining room. Should not happen")
             return@withState
         }
-        val viaServers = state.roomDirectoryData.homeServer?.let {
-            listOf(it)
-        } ?: emptyList()
+        val viaServers = state.roomDirectoryData.homeServer
+                ?.let { listOf(it) }
+                .orEmpty()
         session.joinRoom(action.roomId, viaServers = viaServers, callback = object : MatrixCallback<Unit> {
             override fun onSuccess(data: Unit) {
                 // We do not update the joiningRoomsIds here, because, the room is not joined yet regarding the sync data.

vector/src/main/java/im/vector/app/features/userdirectory/UserListController.kt

@@ -106,7 +106,7 @@ class UserListController @Inject constructor(private val session: Session,
                     currentState.getSelectedMatrixId(),
                     currentState.searchTerm,
                     // to avoid showing twice same user in known and suggestions
-                    currentState.knownUsers.invoke()?.map { it.userId } ?: emptyList()
+                    currentState.knownUsers.invoke()?.map { it.userId }.orEmpty()
             )
         }
     }