[ZEPPELIN-1487] Resolve possible NPEs in storage sync mechanism #1459
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What is this PR for?
This is to resolve possible NPEs in storage mechanism related to empty subject
What type of PR is it?
Bug Fix
Todos
subjectinstead ofnullWhat is the Jira issue?
ZEPPELIN-1487
How should this be tested?
storage tests pass, CI green
Screenshots (if appropriate)
Questions: