[FLUME-3468] fix default value of passwordFile property when userName is set for jms source #405
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In jms source, when passwordFile property in agent config is not set, currently null value is getting passed which causes exception due to
password = Optional.absent();
in https://github.com/apache/flume/blob/trunk/flume-ng-sources/flume-jms-source/src/main/java/org/apache/flume/source/jms/JMSSource.java#L173.This PR, sets default value to empty string in case passwordFile property is not set.