apache / bookkeeper / 770

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jenkins

[bookie-server-config] Avoid considering empty journalDirectories

As discussed at : https://github.com/apache/pulsar/issues/6042

### Issue
We have config management tool which manages bookie-server configuration and sets empty value of `journalDirectories` if bookie-server is still wants to use single journal dir: `journalDirectory`. In this case, bookie-server doesn't consider `journalDirectory` value and keeps empty list of `journalDirectories` which stats bookie with invalid configuration.

### Expected behavior
Bookie-server should parse empty configuration `journalDirectories=` properly and avoid picking up empty value of `journalDirectories` and in that case, bookie-server should fallback to `journalDirectory` config.

Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Sijie Guo <None>

This closes #2245 from rdhabalia/journal_dir

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