Minor fixes.

Author: And1sS

extra/modules/pb-rule-engine/src/main/java/org/prebid/server/hooks/modules/rule/engine/core/config/StageConfigParser.java

@@ -167,9 +167,9 @@ private Rule<T, C> combineRules(Rule<T, C> left, Rule<T, C> right) {
         } else if (left != null && right != null) {
             return AlternativeActionRule.of(left, right);
         } else if (left != null) {
-            return left;
+            return AlternativeActionRule.of(left, NoOpRule.create());
         }
 
-        return right;
+        return AlternativeActionRule.of(right, NoOpRule.create());
     }
 }

extra/modules/pb-rule-engine/src/main/java/org/prebid/server/hooks/modules/rule/engine/core/request/result/functions/filter/FilterBiddersFunctionConfig.java

@@ -19,6 +19,7 @@ public class FilterBiddersFunctionConfig {
     @JsonProperty("seatnonbid")
     BidRejectionReason seatNonBid = BidRejectionReason.REQUEST_BLOCKED_OPTIMIZED;
 
+    @JsonProperty("ifSyncedId")
     Boolean ifSyncedId;
 
     @JsonProperty("analyticsValue")

extra/modules/pb-rule-engine/src/test/java/org/prebid/server/hooks/modules/rule/engine/core/config/StageConfigParserTest.java

@@ -14,8 +14,8 @@
 import org.prebid.server.hooks.modules.rule.engine.core.config.model.SchemaFunctionConfig;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.AlternativeActionRule;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.CompositeRule;
-import org.prebid.server.hooks.modules.rule.engine.core.rules.DefaultActionRule;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.ConditionalRuleFactory;
+import org.prebid.server.hooks.modules.rule.engine.core.rules.DefaultActionRule;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.NoOpRule;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.RandomWeightedRule;
 import org.prebid.server.hooks.modules.rule.engine.core.rules.Rule;
@@ -126,8 +126,9 @@ public void parseShouldCombineModelGroupRulesUnderSameRuleSetIntoRandomWeightedR
         // when and then
         final RandomWeightedRule<Object, Object> weightedRule = RandomWeightedRule.of(
                 randomGenerator,
-                new WeightedList<>(
-                        List.of(WeightedEntry.of(1, matchingRule), WeightedEntry.of(2, matchingRule))));
+                new WeightedList<>(List.of(
+                        WeightedEntry.of(1, AlternativeActionRule.of(matchingRule, NoOpRule.create())),
+                        WeightedEntry.of(2, AlternativeActionRule.of(matchingRule, NoOpRule.create())))));
 
         assertThat(target.parse(accountConfig)).isEqualTo(
                 CompositeRule.of(Collections.singletonList(weightedRule)));
@@ -196,8 +197,10 @@ public void parseShouldBuildRuleTreeAndCreateAppropriateMatchingRule() {
         final AccountConfig accountConfig = givenAccountConfig(modelGroupConfig);
 
         // when and then
+        final AlternativeActionRule<Object, Object> alternativeRule = AlternativeActionRule.of(
+                matchingRule, NoOpRule.create());
         final RandomWeightedRule<Object, Object> weightedRule = RandomWeightedRule.of(
-                randomGenerator, new WeightedList<>(List.of(WeightedEntry.of(1, matchingRule))));
+                randomGenerator, new WeightedList<>(List.of(WeightedEntry.of(1, alternativeRule))));
 
         assertThat(target.parse(accountConfig)).isEqualTo(
                 CompositeRule.of(Collections.singletonList(weightedRule)));