Fix just merged code (#2607)

I forgot to remove a test commit from #2596:
31a066d

Author: trask

agent/azure-monitor-exporter/src/main/java/com/azure/monitor/opentelemetry/exporter/implementation/SpanDataMapper.java

@@ -603,6 +603,9 @@ public static String getHttpUrlFromServerSpan(Attributes attributes) {
       return null;
     }
     String host = attributes.get(SemanticAttributes.NET_HOST_NAME);
+    if (host == null) {
+      return null;
+    }
     Long port = attributes.get(SemanticAttributes.NET_HOST_PORT);
     String target = attributes.get(SemanticAttributes.HTTP_TARGET);
     if (target == null) {