Fix smoketest

Author: heyams

agent/agent-profiler/agent-alerting-api/src/main/java/com/microsoft/applicationinsights/alerting/alert/AlertBreach.java

@@ -80,7 +80,9 @@ public static AlertBreach.Builder builder() {
   @Override
   public JsonWriter toJson(JsonWriter jsonWriter) throws IOException {
     jsonWriter.writeStartObject();
-    jsonWriter.writeStringField("type", type.name());
+    if (type != null) {
+      jsonWriter.writeStringField("type", type.name());
+    }
     jsonWriter.writeDoubleField("alertValue", alertValue);
     jsonWriter.writeJsonField("alertConfiguration", alertConfiguration);
     jsonWriter.writeDoubleField("cpuMetric", cpuMetric);