[Chore] Get rid of RpcNoOperationsRun error
Description
Problem: RpcNoOperationsRun isn't actually required anywhere, but we still have it. Furthermore we still have some code that claims to throw it, but actually can't.
Solution: Remove RpcNoOperationsRun, use NonEmpty strategically to avoid the need to use it.
Related issue(s)
Resolves None, I noticed this off-hand when working on something else more complicated and decided to split it out.
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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