Fix potential NPE on Optional objects

changelog.d/4428.bugfix

@@ -0,0 +1 @@
+Fix potential NullPointerException crashes in Room and User account data sources

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/accountdata/RoomAccountDataDataSource.kt

@@ -43,7 +43,7 @@ internal class RoomAccountDataDataSource @Inject constructor(@SessionDatabase pr
 
     fun getLiveAccountDataEvent(roomId: String, type: String): LiveData<Optional<RoomAccountDataEvent>> {
         return Transformations.map(getLiveAccountDataEvents(roomId, setOf(type))) {
-            it.firstOrNull()?.toOptional()
+            it.firstOrNull().toOptional()
         }
     }
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/user/accountdata/UserAccountDataDataSource.kt

@@ -41,7 +41,7 @@ internal class UserAccountDataDataSource @Inject constructor(@SessionDatabase pr
 
     fun getLiveAccountDataEvent(type: String): LiveData<Optional<UserAccountDataEvent>> {
         return Transformations.map(getLiveAccountDataEvents(setOf(type))) {
-            it.firstOrNull()?.toOptional()
+            it.firstOrNull().toOptional()
         }
     }