Update log symlink logic to check for file existence

[phealy]

What type of PR is this? /kind bug

What this PR does / why we need it: Fixes the logic on symlinking log files to check that they exist first, so that we won't bomb out if one of the files isn't there.

Which issue(s) this PR fixes:

Requirements:

• [ ] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[alexeldeib]

I think we determined this wasn't necessary?