Sorry to be late on this.
I created a new API function to allow creating a topic. You can use it to create a topic in the newly created tag so that it is not empty.
You will need to update both the dcs-client package used in your Meteor app, and the Discourse plugin (latest version is 1.0.30).
What your dev needs to do is to use postCreateTopic() instead of postCreateDcsTags(), as creating the topic will also create the tag. The technical documentation is here.