Fix Nullpointer on empty auction context (prebid#3618)

Author: steffenmllr

src/main/java/org/prebid/server/analytics/reporter/agma/AgmaAnalyticsReporter.java

@@ -116,6 +116,11 @@ public <T> Future<Void> processEvent(T event) {
         }
 
         final AuctionContext auctionContext = contextAndType.getLeft();
+        final String eventType = contextAndType.getRight();
+        if (auctionContext == null) {
+            return Future.succeededFuture();
+        }
+
         final BidRequest bidRequest = auctionContext.getBidRequest();
         final TimeoutContext timeoutContext = auctionContext.getTimeoutContext();
         final PrivacyContext privacyContext = auctionContext.getPrivacyContext();
@@ -134,7 +139,7 @@ public <T> Future<Void> processEvent(T event) {
         }
 
         final AgmaEvent agmaEvent = AgmaEvent.builder()
-                .eventType(contextAndType.getRight())
+                .eventType(eventType)
                 .accountCode(accountCode)
                 .requestId(bidRequest.getId())
                 .app(bidRequest.getApp())

src/test/java/org/prebid/server/analytics/reporter/agma/AgmaAnalyticsReporterTest.java

@@ -109,6 +109,21 @@ public void setUp() {
         target = new AgmaAnalyticsReporter(properties, versionProvider, jacksonMapper, clock, httpClient, vertx);
     }
 
+    @Test
+    public void processEventShouldNotSendAnythingWhenAuctionContextIsNull() {
+        // given
+        final AuctionEvent auctionEvent = AuctionEvent.builder()
+                .auctionContext(null)
+                .build();
+
+        // when
+        final Future<Void> result = target.processEvent(auctionEvent);
+
+        // then
+        verifyNoInteractions(httpClient);
+        assertThat(result.succeeded()).isTrue();
+    }
+
     @Test
     public void processEventShouldSendEventWhenEventIsAuctionEvent() {
         // given