Fix NPE. Make db config optional.

Author: CTMBNara

src/main/java/org/prebid/server/auction/externalortb/ProfilesProcessor.java

@@ -107,7 +107,12 @@ public Future<BidRequest> process(AuctionContext auctionContext, BidRequest bidR
     private AllProfilesIds profilesIds(BidRequest bidRequest, AuctionContext auctionContext, String accountId) {
         final AllProfilesIds initialProfilesIds = new AllProfilesIds(
                 requestProfilesIds(bidRequest),
-                bidRequest.getImp().stream().map(this::impProfilesIds).toList());
+                Optional.ofNullable(bidRequest)
+                        .map(BidRequest::getImp)
+                        .orElse(Collections.emptyList())
+                        .stream()
+                        .map(this::impProfilesIds)
+                        .toList());
 
         final AllProfilesIds profilesIds = truncate(
                 initialProfilesIds,

src/main/java/org/prebid/server/settings/DatabaseApplicationSettings.java

@@ -102,7 +102,7 @@ public DatabaseApplicationSettings(DatabaseClient databaseClient,
                 Objects.requireNonNull(selectAccountQuery));
         this.selectStoredRequestsQuery = Objects.requireNonNull(selectStoredRequestsQuery);
         this.selectAmpStoredRequestsQuery = Objects.requireNonNull(selectAmpStoredRequestsQuery);
-        this.selectProfilesQuery = Objects.requireNonNull(selectProfilesQuery);
+        this.selectProfilesQuery = selectProfilesQuery;
         this.selectStoredResponsesQuery = Objects.requireNonNull(selectStoredResponsesQuery);
     }
 
@@ -186,6 +186,11 @@ public Future<StoredDataResult<Profile>> getProfiles(String accountId,
                                                          Set<String> impIds,
                                                          Timeout timeout) {
 
+        // TODO: remove in PBS 4.0
+        if (selectProfilesQuery == null) {
+            return Future.failedFuture("Profiles storage not configured.");
+        }
+
         return fetchStoredData(
                 selectProfilesQuery,
                 requestIds,

src/main/java/org/prebid/server/spring/config/SettingsConfiguration.java

@@ -104,7 +104,7 @@ DatabaseApplicationSettings databaseApplicationSettings(
                 @Value("${settings.database.account-query}") String accountQuery,
                 @Value("${settings.database.stored-requests-query}") String storedRequestsQuery,
                 @Value("${settings.database.amp-stored-requests-query}") String ampStoredRequestsQuery,
-                @Value("${settings.database.profiles-query}") String profilesQuery,
+                @Value("${settings.database.profiles-query:#{null}}") String profilesQuery,
                 @Value("${settings.database.stored-responses-query}") String storedResponsesQuery,
                 ParametrizedQueryHelper parametrizedQueryHelper,
                 DatabaseClient databaseClient,