Remove extraneous output format plugin WARN message.
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Key: FLUME-789
URL: https://issues.apache.org/jira/browse/FLUME-789
Project: Flume
Issue Type: Improvement
Reporter: Jonathan Hsieh
Priority: Minor
Upon starting the master/node, the stdout says "text.FormatFactory: Unable to
load output format plugin class - Class not found".
This is likely because the flume.plugin.outputformat.classes is empty or has a
space and passes an empty string. If empty it should not output error message.
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