Bug: TypeError crash when PR author is a deleted GitHub account (ghost user)

[Grizouforever]

Description

When a GitHub user deletes their account, the GraphQL API returns null for the author field on their PRs. The current code accesses pr_raw['author']['login'] without null-checking, causing a TypeError that crashes PR processing for the entire miner evaluation.

Affected code

• gittensor/utils/github_api_tools.py line 929: pr_raw['author']['login'] in self-merge check
• gittensor/utils/github_api_tools.py line 933: review['author']['login'] != pr_raw['author']['login'] in review check
• gittensor/classes.py line 277: pr_data['author']['login'] in PullRequest.from_github_data()

Steps to reproduce

1. A miner has a merged PR on a whitelisted repo
2. The PR author later deletes their GitHub account
3. Validator tries to score the miner's PRs
4. TypeError: 'NoneType' object is not subscriptable crashes the evaluation

Expected behavior

PRs from deleted accounts should be gracefully skipped or handled with a fallback login like 'ghost'.

Actual behavior

TypeError crash stops the entire miner evaluation.

[anderdc]

if it crashes the evaluation then that's ok, how can you evaluate an account that doesn't exist. Closing