[Feature]: The default value for deploy's num_units is incompatible with subordiante charms

[sed-i]

Description

When deploying a subordinate charm without providing the num_units arg,

juju.errors.JujuError: ['subordinate application must be deployed without units']

It could be nicer if the default value was None, and then internally set to 0 in case of a subordinate charm (set to 1 otherwise).

python-libjuju/juju/model.py

Lines 1723 to 1727 in f52ca42

	is_sub = await self.charmhub.is_subordinate(url.name)
	if is_sub:
	if num_units > 1:
	raise JujuError("cannot use num_units with subordinate application")
	num_units = 0

Urgency

Casually wishlisting

Code I'd Like to Run

await ops_test.model.deploy(grafana_agent_charm, application_name=agent.name, series="jammy")
# without num_units=0

[github-actions]

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