test fixes

kafka-ui-api/src/test/java/com/provectus/kafka/ui/serdes/builtin/ConsumerOffsetsSerdeTest.java

@@ -85,9 +85,15 @@ class ConsumerOffsetsSerdeTest extends AbstractIntegrationTest {
           .atMost(Duration.ofMinutes(1))
           .untilAsserted(() -> {
             for (var rec : consumer.poll(Duration.ofMillis(200))) {
-              DeserializeResult key = keyDeserializer.deserialize(null, rec.key().get());
-              DeserializeResult val = valueDeserializer.deserialize(null, rec.value().get());
-              polled.add(Tuples.of(key, val));
+              DeserializeResult key = rec.key() != null
+                  ? keyDeserializer.deserialize(null, rec.key().get())
+                  : null;
+              DeserializeResult val = rec.value() != null
+                  ? valueDeserializer.deserialize(null, rec.value().get())
+                  : null;
+              if (key != null && val != null) {
+                polled.add(Tuples.of(key, val));
+              }
             }
             assertThat(polled).anyMatch(t -> isCommitMessage(t.getT1(), t.getT2()));
             assertThat(polled).anyMatch(t -> isGroupMetadataMessage(t.getT1(), t.getT2()));