Register service do not return the id when value of 0.

apm-collector/apm-collector-agentregister/src/main/java/org/skywalking/apm/collector/agentregister/grpc/handler/ApplicationRegisterServiceHandler.java

@@ -29,8 +29,10 @@ public class ApplicationRegisterServiceHandler extends ApplicationRegisterServic
             String applicationCode = applicationCodes.get(i);
             int applicationId = applicationIDService.getOrCreate(applicationCode);
 
-            KeyWithIntegerValue value = KeyWithIntegerValue.newBuilder().setKey(applicationCode).setValue(applicationId).build();
-            builder.addApplication(i, value);
+            if (applicationId != 0) {
+                KeyWithIntegerValue value = KeyWithIntegerValue.newBuilder().setKey(applicationCode).setValue(applicationId).build();
+                builder.addApplication(value);
+            }
         }
         responseObserver.onNext(builder.build());
         responseObserver.onCompleted();

apm-collector/apm-collector-agentregister/src/main/java/org/skywalking/apm/collector/agentregister/grpc/handler/ServiceNameDiscoveryServiceHandler.java

@@ -30,10 +30,13 @@ public class ServiceNameDiscoveryServiceHandler extends ServiceNameDiscoveryServ
             int applicationId = serviceNameElement.getApplicationId();
             String serviceName = serviceNameElement.getServiceName();
             int serviceId = serviceNameService.getOrCreate(applicationId, serviceName);
-            ServiceNameMappingElement.Builder mappingElement = ServiceNameMappingElement.newBuilder();
-            mappingElement.setServiceId(serviceId);
-            mappingElement.setElement(serviceNameElement);
-            builder.addElements(mappingElement);
+
+            if (serviceId != 0) {
+                ServiceNameMappingElement.Builder mappingElement = ServiceNameMappingElement.newBuilder();
+                mappingElement.setServiceId(serviceId);
+                mappingElement.setElement(serviceNameElement);
+                builder.addElements(mappingElement);
+            }
         }
 
         responseObserver.onNext(builder.build());