InvibesBidder: fix parameter parsing issue (#3956)

Author: osulzhenko

src/main/java/org/prebid/server/bidder/invibes/InvibesBidder.java

@@ -247,7 +247,7 @@ private static String resolveWidth(Device device) {
     }
 
     private static String resolveHost(Integer domainId) {
-        if (domainId == 0 || domainId == 1 || domainId == 1001) {
+        if (domainId == null || domainId == 0 || domainId == 1 || domainId == 1001) {
             return "bid";
         } else if (domainId < 1002) {
             return "bid" + domainId;

src/test/java/org/prebid/server/bidder/invibes/InvibesBidderTest.java

@@ -85,6 +85,23 @@ public void makeHttpRequestsShouldCreateCorrectURLFor1003Zone() {
         assertThat(result.getValue().getFirst().getUri()).isEqualTo("https://bid3.videostep.com/bid/");
     }
 
+    @Test
+    public void makeHttpRequestsShouldCreateCorrectURLForNullZone() {
+        // given
+        final BidRequest bidRequest = givenBidRequest(
+                identity(),
+                impBuilder -> impBuilder.banner(Banner.builder().h(BANNER_H).w(BANNER_W).build()),
+                ExtImpInvibes.of("12", null, InvibesDebug.of("test", true)));
+
+        // when
+        final Result<List<HttpRequest<InvibesBidRequest>>> result = target.makeHttpRequests(bidRequest);
+
+        // then
+        assertThat(result.getErrors()).isEmpty();
+        assertThat(result.getValue()).hasSize(1);
+        assertThat(result.getValue().getFirst().getUri()).isEqualTo("https://bid.videostep.com/bid/");
+    }
+
     @Test
     public void makeHttpRequestsShouldCreateCorrectURLFor0Zone() {
         // given