PM-14433 update flow type to nullable so we can handle gracefully and avoid crash. (#4231)

Author: dseverns-livefront

app/src/main/java/com/x8bit/bitwarden/data/vault/datasource/disk/VaultDiskSourceImpl.kt

@@ -17,6 +17,7 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.merge
@@ -124,6 +125,7 @@ class VaultDiskSourceImpl(
     override fun getDomains(userId: String): Flow<SyncResponseJson.Domains> =
         domainsDao
             .getDomains(userId)
+            .filterNotNull()
             .map { entity ->
                 withContext(dispatcherManager.default) {
                     json.decodeFromString<SyncResponseJson.Domains>(entity.domainsJson)

app/src/main/java/com/x8bit/bitwarden/data/vault/datasource/disk/dao/DomainsDao.kt

@@ -25,7 +25,7 @@ interface DomainsDao {
     @Query("SELECT * FROM domains WHERE user_id = :userId")
     fun getDomains(
         userId: String,
-    ): Flow<DomainsEntity>
+    ): Flow<DomainsEntity?>
 
     /**
      * Inserts domains into the database.