Correct missing entry handling to avoid bad warns (bp #8339)

[mergify]

This is an automated backport of pull request #8339 done by Mergify.io

Cherry-pick of d238371 has failed:

On branch mergify/bp/v0.23/pr-8339
Your branch is up to date with 'origin/v0.23'.

You are currently cherry-picking commit d238371b0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   core/src/snapshot_packager_service.rs
	modified:   core/tests/bank_forks.rs
	modified:   ledger-tool/src/main.rs
	modified:   ledger/src/bank_forks.rs
	modified:   ledger/src/snapshot_package.rs
	modified:   ledger/src/snapshot_utils.rs
	modified:   runtime/src/accounts.rs
	modified:   runtime/src/accounts_db.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   runtime/src/bank.rs

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[codecov]

Codecov Report

Merging #8378 into v0.23 will increase coverage by <.1%.
The diff coverage is 86.3%.

@@           Coverage Diff           @@
##           v0.23   #8378     +/-   ##
=======================================
+ Coverage   80.7%   80.7%   +<.1%     
=======================================
  Files        251     251             
  Lines      55076   55129     +53     
=======================================
+ Hits       44475   44520     +45     
- Misses     10601   10609      +8