remove log warnings when credentials are null
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Key: OOZIE-764
URL: https://issues.apache.org/jira/browse/OOZIE-764
Project: Oozie
Issue Type: Bug
Components: workflow
Affects Versions: 3.2.0
Reporter: Alejandro Abdelnur
Priority: Minor
Fix For: 3.2.0
Actions are logging '[Oozie] Could not find credentials properties for: null'
constantly, credentials are not required, thus this logging should be removed
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