Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/834
Running the latest commit, nifi.properties ends up with:
```
nifi.sensitive.props.key.protected=aes/gcm/128
nifi.sensitive.props.key.protected=
```
The app then fails to start because I think it finds the second one and
can't decrypt the sensitive properties key. I can paste the stacktrace if
helpful, but removing the empty one lets the app start.
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