n_models only to initialize modelsets

[vermashresth]

Removed the option to initalize a model set without providing n_models as parameter.
#7223

[astropy-bot]

Hi there @vermashresth 👋 - thanks for the pull request! I'm just a friendly 🤖 that checks for issues related to the changelog and making sure that this pull request is milestoned and labeled correctly. This is mainly intended for the maintainers, so if you are not a maintainer you can ignore this, and a maintainer will let you know if any action is required on your part 😃.

I noticed the following issue with this pull request:

• Changelog entry not present (or pull request number missing) and neither the Affects-dev nor the no-changelog-entry-needed label are set

Would it be possible to fix this? Thanks!

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[nden]

@vermashresth Thanks for investigating and implementing this. There are various other issues with model sets. I want to summarize them and reach an agreement of what needs to be supported and how. So I suggest to keep this open until there's a decision as it may be part of the bigger refactoring.
I am still in favor of limiting the many ways one can create and work with model sets.

[astropy-bot]

Hi humans 👋 - this pull request hasn't had any new commits for approximately 5 months. I plan to close this in a month if the pull request doesn't have any new commits by then.

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[astropy-bot]

⏰ Time's up! ⏰

I'm going to close this pull request as per my previous message. If you think what is being added/fixed here is still important, please remember to open an issue to keep track of it. Thanks!

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