Slight difference between the current bluesky bundler and event model about event-model

[coretl]

For 1) I think that as soon as we compose a descriptor then we should mention the number of events in the stop document, so {'primary': 0, 'baseline': 2} would be reasonable for me.

For 2) I don't understand how a bundle_name of None is added, and why if would be excluded from the stop document.

@danielballan @tacaswell any ideas?

[coretl]

For 2), assert when populating sequence_counters that bundle_name is not None