Fix analysis check

[jorsmatthys]

Hello @NickLiffen

We finally got our GitHub Advanced Security licenses so we are going to start rolling out code-scanning to all repos 🎉 .
I wanted to do some final tests and noticed a bug however.

When you introduced the functionality to no longer create pull-requests for repos that already have code-scanning/analyses I did a quick test to see if it didn't create a pr anymore on a repo that was already scanned and that worked.
Today I tested on some new repo's and I found that a pr was actually never created.

I noticed that when there is no analysis available yet the GitHub Api returns

{
  "message": "no analysis found",
  "documentation_url": "https://docs.github.com/rest/reference/code-scanning#list-code-scanning-analyses-for-a-repository"
}

instead of an empty list, so data.length in this case results in undefined. Perhaps this is something that changed over time.
I only changed the condition a bit and now it seems to work (again).

Also I believe that GitHub changed something to the security model because I had to update my app permissions:

2022-07-12T13:18:49.100Z ghas:error Error: Command failed: git push --set-upstream origin ghas-BEfYw
To https://github.com/liantisit-github-automation-poc/azure-functions-medewerkerspaspoort-poc.git
! [remote rejected] ghas-BEfYw -> ghas-BEfYw (refusing to allow a GitHub App to create or update workflow .github/workflows/codeql-analysis.yml without workflows permission)
error: failed to push some refs to 'https://github.com/liantisit-github-automation-poc/azure-functions-medewerkerspaspoort-poc.git'

I updated the doc accordingly.

Kind regards,
Jors

[NickLiffen]

@jorsmatthys thank you SO MUCH for this pull request 🙇

I love this contribution! Looking back through our changes it looked like something did change, thank you for this 🙇

I will merge this PR now 💯