[Fix] Run epoch no emission

[camfairchild]

Description

When a subnet has a disabled registration during the epoch, we skip giving it emission. This was implemented in #474 but accidentally also skipped the epoch, making the incentive not update as we would expect. This fix emits 0 emission instead of exiting the epoch early.

Related Issue(s)

• Fixes bug from #474

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Other (please describe):

Checklist

• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have run cargo fmt and cargo clippy to ensure my code is formatted and linted correctly
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[distributedstatemachine]

closing in favour of #602