fix: add nil checks for controller and host keeper services (backport #2308)

[mergify]

This is an automatic backport of pull request #2308 done by Mergify.
Cherry-pick of 888c4a0 has failed:

On branch mergify/bp/release/v5.0.x/pr-2308
Your branch is up to date with 'origin/release/v5.0.x'.

You are currently cherry-picking commit 888c4a0.
  (fix conflicts and run "git cherry-pick --continue")
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	deleted by us:   modules/apps/27-interchain-accounts/controller/keeper/migrations.go
	both modified:   modules/apps/27-interchain-accounts/module.go

no changes added to commit (use "git add" and/or "git commit -a")

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

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