fix: cat returning erros for app rejection (backport #2340)

[mergify]

Fixes #2341

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This is an automatic backport of pull request #2340 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of eddeac4 has failed:

On branch mergify/bp/main/pr-2340
Your branch is up to date with 'origin/main'.

You are currently cherry-picking commit eddeac4c.
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Changes to be committed:
	modified:   mempool/cat/pool.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   mempool/cat/pool_test.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[rach-id]

still couple things that need changing

[evan-forbes]

converting to a draft, but agree we should fix and merge